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

namespace _01.Extract_Emails
{
    class Program
    {
        static void Main(string[] args)
        {

            string input = Console.ReadLine();
            string pattern = @"(^|(?<=\s))(([a-zA-Z0-9]+)([\.\-_]?)([A-Za-z0-9]+)(@)([a-zA-Z]+([\.\-_][A-Za-z]+)+))(\b|(?=\s))";

            MatchCollection collection = Regex.Matches(input , pattern);

            foreach (var item in collection)
            {
                Console.WriteLine(item);
            }

        }
    }
}