using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int a = Convert.ToInt32(Console.ReadLine());

        IGuitar guitar;

        guitar = GuitarFactory.getGuitar(a);

        guitar.strum();

    }

    public interface IGuitar

    {

        void strum();   

    }

    public abstract class GuitarFactory

    {

        public static IGuitar getGuitar(int guitarType)

        {

            if (guitarType == 1)

            {

                return new Telecaster();

            }

            if (guitarType == 2)

            {

                return new Stratocaster();

            }

            return null;

        }

    }

    public class Telecaster : IGuitar

    {

        public void strum()

        {

            Console.WriteLine("strumming a tele");

        }

    }

    public class Stratocaster :IGuitar

    {

        public void strum()

        {

            Console.WriteLine("strumming a strat.");

        }

    }

}