Console.WriteLine("Enter:");

            string reply = Console.ReadLine();
            while (reply != "T" && reply != "F")
            {
                Console.WriteLine("Invalid");
                reply = Console.ReadLine();
            }
            if (reply == "T")
            {
                Console.WriteLine("true");
                Console.ReadLine();
            }
            else if (reply == "F")
            {
                Console.WriteLine("true");
                Console.ReadLine();
            }