diff --git a/src/crypto/Crypto.java b/src/crypto/Crypto.java
index 51d57b7..4b8e5be 100644
--- a/src/crypto/Crypto.java
+++ b/src/crypto/Crypto.java
@@ -3,8 +3,47 @@
 import java.util.Scanner;
 
 public class Crypto {
+    static String operation;
+    static String inputText;
+    static int key;
+
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
-	// write your code here
+        if (scanner.hasNextLine()) {
+            operation = scanner.nextLine();
+        }
+        if (scanner.hasNextLine()) {
+            inputText = scanner.nextLine();
+        }
+        if (scanner.hasNextInt()) {
+            key = scanner.nextInt();
+        }
+        if("enc".equals(operation)){
+            encrypt(inputText, key);
+        }else if("dec".equals(operation)){
+            decrypt(inputText, key);
+
+        }
+
+    }
+
+    public static void encrypt(String text, int key) {
+        char[] charText = text.toCharArray();
+        for (int i = 0; i < charText.length; i++) {
+            char tmp = (char) (charText[i]+key);
+            charText[i] = tmp;
+        }
+        String encryptText = new String(charText);
+        System.out.println(encryptText);
+    }
+
+    public static void decrypt(String text, int key) {
+        char[] charText = text.toCharArray();
+        for (int i = 0; i < charText.length; i++) {
+            char tmp = (char) (charText[i]-key);
+            charText[i] = tmp;
+        }
+        String decryptText = new String(charText);
+        System.out.println(decryptText);
     }
 }