diff --git a/Untitled.mdj b/Untitled.mdj
new file mode 100644
index 0000000..717415b
--- /dev/null
+++ b/Untitled.mdj
@@ -0,0 +1,1211 @@
+{
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+									"hostEdge": {
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+									"text": "sí"
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+									"text": "no"
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+					"_parent": {
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+					"name": "ingresa palabra1 y palabra 2",
+					"ownedElements": [
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+							"_type": "FCFlow",
+							"_id": "AAAAAAF0rdW9bmfddXo=",
+							"_parent": {
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+								"$ref": "AAAAAAF0rdW9DWfVUD8="
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+				},
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+					"_id": "AAAAAAF0rdW9DWfVUD8=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
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+					"ownedElements": [
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+								"$ref": "AAAAAAF0rdW9DWfVUD8="
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+								"$ref": "AAAAAAF0rdbkDGfnuF0="
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+					]
+				},
+				{
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+					"_id": "AAAAAAF0rdbkDGfnuF0=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
+					},
+					"name": "tamaño palabra1",
+					"ownedElements": [
+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0rde+KGgJwUc=",
+							"_parent": {
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+								"$ref": "AAAAAAF0rdbkDGfnuF0="
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+							"target": {
+								"$ref": "AAAAAAF0rde91mgBrSE="
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+					"_id": "AAAAAAF0rde91mgBrSE=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
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+					"name": "Lenght palabra 2",
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+						{
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+							"_id": "AAAAAAF0rdn0Bmgf8H8=",
+							"_parent": {
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+								"$ref": "AAAAAAF0rde91mgBrSE="
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+							"target": {
+								"$ref": "AAAAAAF0rdnzs2gXE1Y="
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+				},
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+					"_id": "AAAAAAF0rdnzs2gXE1Y=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
+					},
+					"name": "Son del mismo tamaño?",
+					"ownedElements": [
+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0rdrQAmg86aY=",
+							"_parent": {
+								"$ref": "AAAAAAF0rdnzs2gXE1Y="
+							},
+							"name": "sí",
+							"source": {
+								"$ref": "AAAAAAF0rdnzs2gXE1Y="
+							},
+							"target": {
+								"$ref": "AAAAAAF0rdrPrGg0t1k="
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+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0rfNJ0mjYdSU=",
+							"_parent": {
+								"$ref": "AAAAAAF0rdnzs2gXE1Y="
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+								"$ref": "AAAAAAF0rdnzs2gXE1Y="
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+							"target": {
+								"$ref": "AAAAAAF0rfH17mi53OU="
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+				},
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+					"_type": "FCProcess",
+					"_id": "AAAAAAF0rdrPrGg0t1k=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
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+					"name": "compara letra n palabra 1 con letra n palabra 2",
+					"ownedElements": [
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+							"_parent": {
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+								"$ref": "AAAAAAF0rdyEf2hPryk="
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+					"_id": "AAAAAAF0rdyEf2hPryk=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
+					},
+					"name": "són iguales?",
+					"ownedElements": [
+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0re1up2hxJac=",
+							"_parent": {
+								"$ref": "AAAAAAF0rdyEf2hPryk="
+							},
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+							"target": {
+								"$ref": "AAAAAAF0re1uR2hpEMU="
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+						},
+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0re4mS2iLkBA=",
+							"_parent": {
+								"$ref": "AAAAAAF0rdyEf2hPryk="
+							},
+							"name": "no",
+							"source": {
+								"$ref": "AAAAAAF0rdyEf2hPryk="
+							},
+							"target": {
+								"$ref": "AAAAAAF0re3ZdGiBAUg="
+							}
+						},
+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0rfJht2jMaRo=",
+							"_parent": {
+								"$ref": "AAAAAAF0rdyEf2hPryk="
+							},
+							"name": "sí",
+							"source": {
+								"$ref": "AAAAAAF0rdyEf2hPryk="
+							},
+							"target": {
+								"$ref": "AAAAAAF0rfH17mi53OU="
+							}
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+				},
+				{
+					"_type": "FCProcess",
+					"_id": "AAAAAAF0re1uR2hpEMU=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
+					},
+					"name": "Process1"
+				},
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+					"_type": "FCDatabase",
+					"_id": "AAAAAAF0re3ZdGiBAUg=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
+					},
+					"name": "count +1",
+					"ownedElements": [
+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0re6ZT2ievcs=",
+							"_parent": {
+								"$ref": "AAAAAAF0re3ZdGiBAUg="
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+							"source": {
+								"$ref": "AAAAAAF0re3ZdGiBAUg="
+							},
+							"target": {
+								"$ref": "AAAAAAF0re6Y62iWqfw="
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+				},
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+					"_type": "FCDecision",
+					"_id": "AAAAAAF0re6Y62iWqfw=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
+					},
+					"name": "es la ultima letra",
+					"ownedElements": [
+						{
+							"_type": "FCFlow",
+							"_id": "AAAAAAF0rfESg2ipaFI=",
+							"_parent": {
+								"$ref": "AAAAAAF0re6Y62iWqfw="
+							},
+							"name": "no",
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+								"$ref": "AAAAAAF0re6Y62iWqfw="
+							},
+							"target": {
+								"$ref": "AAAAAAF0rdrPrGg0t1k="
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+							"_type": "FCFlow",
+							"_id": "AAAAAAF0rfIk4GjDLns=",
+							"_parent": {
+								"$ref": "AAAAAAF0re6Y62iWqfw="
+							},
+							"source": {
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+							},
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+								"$ref": "AAAAAAF0rfH17mi53OU="
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+					"_type": "FCTerminator",
+					"_id": "AAAAAAF0rfH17mi53OU=",
+					"_parent": {
+						"$ref": "AAAAAAF0rdUEwmfGqw4="
+					},
+					"name": "retornar count"
+				}
+			]
+		}
+	]
+}
\ No newline at end of file
diff --git a/flow.png b/flow.png
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index 0000000..ac4d188
Binary files /dev/null and b/flow.png differ
diff --git a/package-lock.json b/package-lock.json
index 55e81cf..58a262e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -426,6 +426,12 @@
         "@babel/types": "^7.3.0"
       }
     },
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+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
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@@ -451,6 +457,12 @@
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     },
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+      "resolved": "https://registry.npmjs.org/@types/parse-json/-/parse-json-4.0.0.tgz",
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+      "dev": true
+    },
     "@types/stack-utils": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-1.0.1.tgz",
@@ -976,6 +988,12 @@
         "delayed-stream": "~1.0.0"
       }
     },
+    "compare-versions": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/compare-versions/-/compare-versions-3.6.0.tgz",
+      "integrity": "sha512-W6Af2Iw1z4CB7q4uU4hv646dW9GQuBM+YpC0UvUCWSD8w90SJjp+ujJuXaEMtAXBtSqGfMPuFOVn4/+FlaqfBA==",
+      "dev": true
+    },
     "component-emitter": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
@@ -1009,6 +1027,39 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
+    "cosmiconfig": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
+      "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
+      "dev": true,
+      "requires": {
+        "@types/parse-json": "^4.0.0",
+        "import-fresh": "^3.2.1",
+        "parse-json": "^5.0.0",
+        "path-type": "^4.0.0",
+        "yaml": "^1.10.0"
+      },
+      "dependencies": {
+        "parse-json": {
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+          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.1.0.tgz",
+          "integrity": "sha512-+mi/lmVVNKFNVyLXV31ERiy2CY5E1/F6QtJFEzoChPRwwngMNXRDQ9GJ5WdE2Z2P4AujsOi0/+2qHID68KwfIQ==",
+          "dev": true,
+          "requires": {
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@@ -1515,6 +1566,15 @@
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       }
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+    "find-versions": {
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+      "resolved": "https://registry.npmjs.org/find-versions/-/find-versions-3.2.0.tgz",
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+      }
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       "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",
@@ -2286,6 +2346,125 @@
         "sshpk": "^1.7.0"
       }
     },
+    "husky": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.0.tgz",
+      "integrity": "sha512-tTMeLCLqSBqnflBZnlVDhpaIMucSGaYyX6855jM4AguGeWCeSzNdb1mfyWduTZ3pe3SJVvVWGL0jO1iKZVPfTA==",
+      "dev": true,
+      "requires": {
+        "chalk": "^4.0.0",
+        "ci-info": "^2.0.0",
+        "compare-versions": "^3.6.0",
+        "cosmiconfig": "^7.0.0",
+        "find-versions": "^3.2.0",
+        "opencollective-postinstall": "^2.0.2",
+        "pkg-dir": "^4.2.0",
+        "please-upgrade-node": "^3.2.0",
+        "slash": "^3.0.0",
+        "which-pm-runs": "^1.0.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
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+          "dev": true,
+          "requires": {
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+            "color-convert": "^2.0.1"
+          }
+        },
+        "chalk": {
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+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
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+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
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+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
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+          "dev": true,
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
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+          "dev": true
+        },
+        "find-up": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+          "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^5.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "has-flag": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
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+          "dev": true
+        },
+        "locate-path": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+          "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^4.1.0"
+          }
+        },
+        "p-locate": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+          "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.2.0"
+          }
+        },
+        "path-exists": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
+          "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==",
+          "dev": true
+        },
+        "pkg-dir": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-4.2.0.tgz",
+          "integrity": "sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==",
+          "dev": true,
+          "requires": {
+            "find-up": "^4.0.0"
+          }
+        },
+        "slash": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
+          "integrity": "sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
+        }
+      }
+    },
     "iconv-lite": {
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -2295,6 +2474,24 @@
         "safer-buffer": ">= 2.1.2 < 3"
       }
     },
+    "import-fresh": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.2.1.tgz",
+      "integrity": "sha512-6e1q1cnWP2RXD9/keSkxHScg508CdXqXWgWBaETNhyuBFz+kUZlKboh+ISK+bU++DmbHimVBrOz/zzPe0sZ3sQ==",
+      "dev": true,
+      "requires": {
+        "parent-module": "^1.0.0",
+        "resolve-from": "^4.0.0"
+      },
+      "dependencies": {
+        "resolve-from": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+          "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
+          "dev": true
+        }
+      }
+    },
     "import-local": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/import-local/-/import-local-2.0.0.tgz",
@@ -3115,6 +3312,12 @@
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       "dev": true
     },
+    "json-parse-even-better-errors": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz",
+      "integrity": "sha512-xyFwyhro/JEof6Ghe2iz2NcXoj2sloNsWr/XsERDK/oiPCfaNhl5ONfp+jQdAZRQQ0IJWNzH9zIZF7li91kh2w==",
+      "dev": true
+    },
     "json-schema": {
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/json-schema/-/json-schema-0.2.3.tgz",
@@ -3188,6 +3391,12 @@
         "type-check": "~0.3.2"
       }
     },
+    "lines-and-columns": {
+      "version": "1.1.6",
+      "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.1.6.tgz",
+      "integrity": "sha1-HADHQ7QzzQpOgHWPe2SldEDZ/wA=",
+      "dev": true
+    },
     "load-json-file": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-4.0.0.tgz",
@@ -3571,6 +3780,12 @@
         "wrappy": "1"
       }
     },
+    "opencollective-postinstall": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/opencollective-postinstall/-/opencollective-postinstall-2.0.3.tgz",
+      "integrity": "sha512-8AV/sCtuzUeTo8gQK5qDZzARrulB3egtLzFgteqB2tcT4Mw7B8Kt7JcDHmltjz6FOAHsvTevk70gZEbhM4ZS9Q==",
+      "dev": true
+    },
     "optionator": {
       "version": "0.8.3",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
@@ -3630,6 +3845,15 @@
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       "dev": true
     },
+    "parent-module": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
+      "integrity": "sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==",
+      "dev": true,
+      "requires": {
+        "callsites": "^3.0.0"
+      }
+    },
     "parse-json": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-4.0.0.tgz",
@@ -3715,6 +3939,15 @@
         "find-up": "^3.0.0"
       }
     },
+    "please-upgrade-node": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/please-upgrade-node/-/please-upgrade-node-3.2.0.tgz",
+      "integrity": "sha512-gQR3WpIgNIKwBMVLkpMUeR3e1/E1y42bqDQZfql+kDeXd8COYfM8PQA4X6y7a8u9Ua9FHmsrrmirW2vHs45hWg==",
+      "dev": true,
+      "requires": {
+        "semver-compare": "^1.0.0"
+      }
+    },
     "pn": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/pn/-/pn-1.1.0.tgz",
@@ -4026,6 +4259,18 @@
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       "dev": true
     },
+    "semver-compare": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/semver-compare/-/semver-compare-1.0.0.tgz",
+      "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w=",
+      "dev": true
+    },
+    "semver-regex": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/semver-regex/-/semver-regex-2.0.0.tgz",
+      "integrity": "sha512-mUdIBBvdn0PLOeP3TEkMH7HHeUP3GjsXCwKarjv/kGmUFOYg1VqEemKhoQpWMu6X2I8kHeuVdGibLGkVK+/5Qw==",
+      "dev": true
+    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -4719,6 +4964,12 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
+      "dev": true
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
@@ -4774,6 +5025,12 @@
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       "dev": true
     },
+    "yaml": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
+      "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg==",
+      "dev": true
+    },
     "yargs": {
       "version": "13.3.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
diff --git a/src/index.js b/src/index.js
index 243d154..ec23080 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,8 +4,25 @@
  * @return {number}
  */
 
-const hammingDistance = (a, b) => {
-    
+const hammingDistance = (word1, word2) => {
+    let distance = 0,
+    lengthWord1 = word1.length,
+    lengthWord2 = word2.length
+
+    if( lengthWord1 !== lengthWord2) {
+      throw 'provide '
+    } else {
+      let index = 0
+      for (const letter of word1) {
+        if(letter != word2[index]) {
+          ++distance
+        }
+      ++index
+      }
+    }
+
+    return distance
+
   }
   
   module.exports = hammingDistance;
\ No newline at end of file