using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string emailaddr="bhanuyaragadda@ups.comsumitsingh@ups.com";

        string pattern = @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{3,}$";

        if( Regex.IsMatch(emailaddr, pattern))

            Console.WriteLine( "true");

        else

            Console.WriteLine( "false");

    }

}