using System;

public class Program

{

    public static void Main()

    {

        int num = 0;

        while(num != -1)

        {

            Console.Write("Enter a number (enter a -1 to exit):");

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

            if(num != -1)

            {

                Console.WriteLine("You have entered: " + num.ToString());

            }

        }

        Console.WriteLine("You have ended your program");

    }

}