using System;

​

public interface A

{

    void Metoda1();

}

public interface B:A

{

 void Metoda2();

 void Metoda3();

}

public class Afisare:B

{

    public void Metoda1()

    {

        Console.WriteLine("1");

    }

    public void Metoda2()

    {

        Console.WriteLine("2");

    }

    public void Metoda3()

    {

        Console.WriteLine("3");

    }

}

public class Program

{

    public static void Main()

    {

        Afisare nr=new Afisare();

        nr.Metoda1();

        nr.Metoda2();

        nr.Metoda3();

    }

}