using System;

​

public class Program

{

    public static void Main()

    {

        int a, b, c, d, t;

        Console.WriteLine("Enter int number in a=");

        a = int.Parse(Console.ReadLine());

        Console.WriteLine("Enter int number in b=");

        b = int.Parse(Console.ReadLine());

        Console.WriteLine("Enter int number in c=");

        c = int.Parse(Console.ReadLine());

        Console.WriteLine("Enter int number in d=");

        d = int.Parse(Console.ReadLine());

        Console.WriteLine("a={0} b={1} c={2} d={3} ", a, b, c, d);

        t = a;

        a = b;

        b = c;

        c = d;

        d = t;

        Console.WriteLine("a={0} b={1} c={2} d={3} ", a, b, c, d);

    }

}