diff --git a/Exercises/1-key.js b/Exercises/1-key.js
index ba7e53a..605a10e 100644
--- a/Exercises/1-key.js
+++ b/Exercises/1-key.js
@@ -1,9 +1,10 @@
 'use strict';
-
 const generateKey = (length, possible) => {
-  // Generate string of random characters
-  // Use Math.random() and Math.floor()
-  // See documentation at MDN
+  let resStr = '';
+  for (let i = 0; i < length; i++) {
+    const charInd = Math.floor(Math.random() * (possible.length));
+    resStr += possible[charInd];
+  }
+  return resStr;
 };
-
 module.exports = { generateKey };