using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Въведи число"); 

        string text = Console.ReadLine(); 

        while (text != "stop")

        {

            Console.Write("Wrong message"); 

            text= Console.ReadLine(); 

        }

        Console.Write("Right message"); 

        Console.ReadLine();

    }

}