using System;

public class Program

{

    public interface ICanFly

    {

        public void Fly();

    }

    public class Dragon : ICanFly

    {

        public void Fly()

        {

            Console.WriteLine("Looking for village to destroy");

        }

    }

    public class Bird : ICanFly

    {

        public void Fly()

        {

            Console.WriteLine("Doing bird things");

        }

    }

    public class Launcher

    {

        public static void Launch(ICanFly somethingThatCanFlyAndIDoNotCareHow)

        {

            somethingThatCanFlyAndIDoNotCareHow.Fly();

        }

    }   

​

    public static void Main()

    {

        Launcher.Launch(new Bird());

        Launcher.Launch(new Dragon());

    }

}