using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<string> recipients =                    

                    new System.Text.RegularExpressions.Regex("[\\w@\\.]+")

                        .Matches("jussa@ang-mars.fi")

                        .Cast<System.Text.RegularExpressions.Match>()

                        .Select(match => match.Value).ToList();

        Console.WriteLine(recipients[0]);

    }

}