diff --git a/src/crypto/Crypto.java b/src/crypto/Crypto.java
index 51d57b7..8dd7fa0 100644
--- a/src/crypto/Crypto.java
+++ b/src/crypto/Crypto.java
@@ -1,10 +1,37 @@
-package crypto;
-
-import java.util.Scanner;
-
 public class Crypto {
     public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
-	// write your code here
+      //  File file = new File(args[7]);
+      //  Scanner scanner = new Scanner(file);
+        String mode ="dec";
+        String comm = "in";
+        String data = "data";
+        if(args[4].equals(data)){
+            char[] dataText = args[5].toCharArray();
+            int keyNumber = Integer.parseInt(args[3]);
+      
+            if (args[1].equals(mode)){
+            for (int x = 0; x < dataText.length; x = x + 1) {
+	            int y = (int)dataText[x]-keyNumber;
+                System.out.print((char)y);
+	            } 
+            }   
+            }else {
+                 File file = new File(args[5]);
+                 Scanner scanner = new Scanner(file);  
+                 String data1 = scanner.nextLine();
+                 char[] dataText = data1.toCharArray();
+            int keyNumber = Integer.parseInt(args[3]);
+      
+            if (args[1].equals(mode)){
+            for (int x = 0; x < dataText.length; x = x + 1) {
+	            int y = (int)dataText[x]-keyNumber;
+                System.out.print((char)y);
+	            } 
+            }   
+                
+            }
+            
+            File file = new File(args[7]);
+            FileWriter writer = new FileWriter(file); 
     }
 }