using System;

public class Program

{

    public static void Main(string[] args)

    {

        var code = "";

        while (code != "secret")

        {

            Console.WriteLine("What is the pass code?");

            code = Console.ReadLine();

​

            if(code != "secret")

            {

                Console.WriteLine("Not Authenticated");

            }

        }

        Console.WriteLine("Authenticated");

    }

}