using System;

interface IClonable { object Clone(); }

class A : IClonable

{

    public object Clone() { return new A(); }

}

class B : A, IClonable

{

    object IClonable.Clone() {

        return new B();

    }

}

public class Program

{

    public static void Main()

    {

        A a = new B();

        Console.WriteLine(a.Clone().GetType());

        Console.WriteLine(((IClonable)a).Clone().GetType());

    }

}