using System;

public class Program

{

    public static void Main()

    {

        int num1, num2;

Console.WriteLine("enter two numbers :");

num1 = int.Parse(Console.ReadLine());

num2 = int.Parse(Console.ReadLine());

while (num1 * num2 != 0);

Console.WriteLine(num1 + " " + num2);

int.Parse(Console.ReadLine())

    }

}