using System;

namespace Program

{

    public class CanisLupus 

    {

        public void Howl() => 

            Console.WriteLine("Awooooo");

    }

​

    public class Familiaris : CanisLupus

    {

        public void Bark() =>

            Console.WriteLine("Rufff");

    }

​

    public class Zoo 

    {

        public Zoo(CanisLupus wolf) => Wolf = wolf;

        public CanisLupus Wolf { get; set; }

    }

​

    public class Program {

        public static void Main(string[] args)

        {

            var myZoo = new Zoo(new Familiaris());

            myZoo.Wolf.Howl();

        }

    }

}