using System;
using System.Text.RegularExpressions;

namespace _1021___Extract_Emails
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();

            string pattern = @"(?<= )[A-Za-z0-9]+([\.|\-]\w*)?[^.-_]@\w+[\.|\-]+\w+[\.]*\w*[\.]*\w*\b";
            Regex regex = new Regex(pattern);
            MatchCollection matc = regex.Matches(input);

            foreach (Match item in matc)
            {
                Console.WriteLine(item.Value);
            }
        }
    }
}