using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

public abstract class NumberGenerator 

{ 

public virtual int GetNumber()

{ 

    return 5;

}

}

public class RandomNumberGenerator : NumberGenerator

{

    private Random random = new Math.

public override int GetNumber() 

{ 

var x=9; 

}

}