emailExtract

using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string patternText = @"[A-Za-z.\d]+\@[A-Za-z]+\.[A-Za-z.]*(?=.|\s)";
            string result = string.Empty;
            Regex regexEmail = new Regex(patternText);
            foreach (var item in regexEmail.Matches(input))
            {
                Console.WriteLine(item);
            }
        }
    }
}