using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace

{

    class Program

    {

        static void Main(string[] args)

        {

            goHomeByTrain bytrain = new goHomeByTrain();

            bytrain.sele();

        }

    }

    public class goHomeByTrain : selebreate

    {

        protected  override void GoHomeBy()

        {

            Console.WriteLine("go home by train!");

        }

    }

    public abstract class selebreate

    {

        public void sele()

        {

            BookTicket();

            GoHomeBy();

            SelebreateFe();

        }

     protected virtual     void   GoHomeBy()

    {

        Console.WriteLine("go home by ...");

    }

      protected  void   SelebreateFe()

{

    Console.WriteLine("selebreate Spring Festival ");

}

        protected  void BookTicket()

        {

        Console.WriteLine ("Book ticket!");

        }

    }

}