using System;

public class Program

{

    public interface IPizdatable

    {

        string GetName();       

    }

    public class A : IPizdatable

    {

        public string GetName()

        {

            return this.GetType().UnderlyingSystemType.Name;

        }

    }

    public class B : A

    {

    }

    public class C :  B

    {

    }

    public static void Main()

    {

        A a = new A();

        B b = new B();

        C c = new C();

        Console.WriteLine((a as IPizdatable).GetName());

        Console.WriteLine((b as IPizdatable).GetName());

        Console.WriteLine((c as IPizdatable).GetName());

    }

}