EGN

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EgnValidatingg
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please enter EGN !");
            CheckEGN();
        }
        static void CheckEGN()
        {
            string EGN = Console.ReadLine();
            if (EGN.Any(Char.IsSymbol) || EGN.Length != 10 || EGN.Any(Char.IsLetter))
            {
                Console.WriteLine("Invalid format.EGN must contain only digits ! ");
            }
            else
            {
                 Console.WriteLine("Valid EGN format");
            }

            }
        }
 }