using System;

public class Program

{

    public static void Main()

    {   

        string var1;

        string var2;

        Console.WriteLine("Ingresar Variable 1: ");

        var1 = Console.ReadLine();

        Console.WriteLine("Ingresar Variable 2: ");

        var2= Console.ReadLine();

        IntercambiarVariables(ref var1, ref var2);

        Console.WriteLine("Var 1 = " + var1 + "Var 2= " + var2);

    }

    static private void IntercambiarVariables(ref string var1, ref string var2){

        string aux;

        aux = var1;

        var1 = var2;

        var2 = aux;

    }

}