class Program
    {
        static void Main(string[] args)
        {
            int num1, num2 = 0;
            string st1, st2, st;
            st2 = "stop";
            Console.WriteLine("plz enter a string");
            st1 = Console.ReadLine();
            while (st1 != st2)
            {
                Console.WriteLine("plz enter new string");
                st1 = Console.ReadLine();
                num1 = st1.Length;
                if (num1 > num2)
                    st1 = st;

            }