using System.IO;

using System;

​

public class Program

{

    static void encrypt(){

        string op="";

        Console.WriteLine("Enter The Data:");

        string data=Console.ReadLine();

        data=data.ToUpper();

        Console.WriteLine(data);

        Console.WriteLine("Enter Key");

        int key = Int32.Parse(Console.ReadLine());

        key=key%32;

        for(int i=0;i<data.Length;i++){

            int ascii=0;

            ascii=data[i];

            ascii+=key;

            op+=Convert.ToChar(ascii);

        }

        Console.WriteLine("Encrypted Data: "+op);

    }

     static void decrypt(){

          string op="";

        Console.WriteLine("Enter The Data:");

        string data=Console.ReadLine();

        Console.WriteLine("Enter Key");

        int key = Int32.Parse(Console.ReadLine());

        key=key%32;

        for(int i=0;i<data.Length;i++){

            int ascii=0;

            ascii=data[i];

            ascii-=key;

            op+=Convert.ToChar(ascii);

        }

        Console.WriteLine("Decrypted Data: "+op);

    }

   public static void Main()

    {

        Console.WriteLine("1. Encrypt\n2.Decrypt\nEnter your option:");

        int opt = Int32.Parse(Console.ReadLine());

        if(opt==1){encrypt();}

        else{decrypt();}

    }

}