static void Main(string[] args)
{
IAuthor sergeyNemchinskiyAuthor = new Author("Sergey Nemchinskiy");
ISubscriber maksimSubscriber = new Subscriber("Maksim");
ISubscriber vasaSubscriber = new Subscriber("Vasya");
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine(sergeyNemchinskiyAuthor.AddSubscriber(maksimSubscriber));
Console.WriteLine(sergeyNemchinskiyAuthor.AddSubscriber(vasaSubscriber));
Console.WriteLine();
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine(sergeyNemchinskiyAuthor.NotifySubscriber());
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine(sergeyNemchinskiyAuthor.RemoveSubscriber(vasaSubscriber));
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine(sergeyNemchinskiyAuthor.NotifySubscriber());
Console.ReadLine();
}