using System;
using System.Text.RegularExpressions;

namespace ExtractEmails
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            //string pattern = @"\b[A-Za-z][A-Za-z0-9\.\-_]+@[A-Za-z][A-Za-z\-]+[A-Za-z]\.[A-Za-z][A-Za-z]+";
            //string pattern = @"(?<=\s)[A-Za-z][A-Za-z0-9\.\-_]*@[A-Za-z][A-Za-z\-]+[A-Za-z]\.[A-Za-z][A-Za-z]+";
            //string pattern = @"(?<=\s)[A-Za-z0-9]+[\.\-]*[A-Za-z0-9]+@[A-Za-z]+[\.\-]*[A-Za-z]+\.[A-Za-z]{2,}";
            string pattern = @"(?<=\s)[A-Za-z0-9]+[\.\-_]*[A-Za-z0-9]+@[A-Za-z]+(?:[\.\-]*[A-Za-z]+)?\.[A-Za-z]{2,}";

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

            foreach (Match email in emails)
            {
                Console.WriteLine(email.Value);
            }
        }
    }
}