using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public abstract class Store {

        public abstract Pizza CreatePizza(string name);

    }

    public class AusStore: Store {

        public override Pizza CreatePizza(string code) {

            return new CheesePizza();

        }

    }

    public abstract class Pizza {

    }

    public class CheesePizza: Pizza{

    }

}