using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication49
{
    class Program
    {
        static void Main(string[] args)
        {

        }
    }

    class Car
    {

    }

    class Engine
    {
        public virtual int StartEngine()
        {
            return 0;
        }
    }

    class Electro : Engine
    {

    }

    class Sl4 : Engine
    {

    }

    class sl6 : Engine
    {

    }
}