using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter 2 numbers for swap");

        int number1 = Convert.ToInt32(Console.ReadLine());

        int number2 = Convert.ToInt32(Console.ReadLine());

        int temp;

        Console.WriteLine("The 2 numbers BEFORE swap are {0}, {1}", number1, number2);

        //number1 = number1 + number2; //a=15 (5+10)      

       // number2 = number1 - number2; //b=5 (15-10)      

       // number1= number1- number2; //a=10 (15-5)   

            temp = number1;

            number1 = number2;

            number2 = temp;

        Console.WriteLine("The 2 numbers AFTER swap are {0}, {1}", number1, number2);

    }

}