using System;

public class Program

{

    interface IA 

    {

        public void Print() => Console.WriteLine("IA");

    }

    public class C : IA

    {

        public void Print()

        {

            base.Print();

        }

    }

    public static void Main()

    {

        C c= new ();

        c.Print();

        Console.WriteLine("Hello World 2");

    }

}