using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {       

        if(isValidFirstName("Kisfaa"))

          {

         Console.WriteLine("VALID");

          }

        else {

         Console.WriteLine("NOT VALID");

        }

    }

     public static bool isValidFirstName(string emailid)

        {

            Regex regex = new Regex(@"^([A-Z][a-z]{2,12})$"); 

            Match match = regex.Match(emailid);

            if (match.Success)

            {

                return true;

            }

            else

            {

                return false;

            }

        }

    public static bool verifyEmailValid(string emailid)

        {

            Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,11})+)$");

            Match match = regex.Match(emailid);

            if (match.Success)

            {

                return true;

            }

            else

            {

                return false;

            }

        }

}