using System;

using System.Text.RegularExpressions;

//https://www3.ntu.edu.sg/home/ehchua/programming/howto/Regexe.html

​

namespace regex{

    public class regexExample{

        public static void Main(string[] args) {

            //string pattern=@"^\w+[\d]+@[a-z]+\.[a-z]{2,3}$";    //Manisha#1234_@gmail.com or manisha@edu.in 

            string pattern=@"^\d{10}$";  //9876543210 for 10 digit mobile number

            string inputText = Console.ReadLine();

            bool result= Regex.IsMatch(inputText, pattern);

            Console.WriteLine(result);

​

        }

    }

}