diff --git a/tasks/5. Caesar cipher/caesar.js b/tasks/5. Caesar cipher/caesar.js
index 30667d1..f57b392 100644
--- a/tasks/5. Caesar cipher/caesar.js	
+++ b/tasks/5. Caesar cipher/caesar.js	
@@ -1,3 +1,21 @@
 export function encryptCaesar(inputString, key) {
   // TODO: write your code here
+ const legend = 'abcdefghijklmnopqrstuvwxyz'.split('');
+   const map = getMap(legend, key);
+   return inputString
+   .toLowerCase()
+   .split('')
+   .map(char => map[char] || char)
+   .join('');
 }
+const getMap = (legend, shift) => {
+   return legend.reduce((charsMap, currentChar, charIndex) => {
+      const copy = { ...charsMap };
+      let ind = (charIndex + shift) % legend.length;
+      if (ind < 0) {
+         ind += legend.length;
+      };
+      copy[currentChar] = legend[ind];
+      return copy;
+   }, {});
+};