ExtractEmails

using System;
using System.Text.RegularExpressions;

namespace _1.ExtractEmails
{
    class ExtractEmails
    {
        static void Main()
        {
            string pattern = @"(\b\w+\.?\w+)@(\w+.\w+\.?\w+)";
            string input = Console.ReadLine();

            foreach (Match m in Regex.Matches(input, pattern))
            {
                Console.WriteLine(m.Value);
            }
        }
    }
}