using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        String t1= "temp1";

        String t2= "temp2";

        Swap(ref t1, ref t2);

        Console.WriteLine(t1+t2);

        int t3 = 4;

        int t4 = 5;

        Swap(ref t3, ref t4);

        Console.WriteLine(t3+t4);

    }

    static void Swap<T>(ref T a,ref T b){

         T temp = a;

         a=b;

         b=temp;

    }

}