using System.IO;

using System;

​

class hack1

{

    public void h()

    {

        Console.WriteLine("hi");

    }

}

class hack2: hack1

{

    virtual public void h()

    {

        Console.WriteLine("hello");

    }

}

class Hack

{

    public static void main()

    {

        hack h1=new hack2();

        h1.h();

        h1= new hack1();

        h1.h();

    }

}