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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            WoodDuck qua = new WoodDuck();
            qua.DuckFly();

        }
    }
    interface FlyBehavior {
        void fly();
    }

    class FlyWithWings:FlyBehavior {
        public void fly() {
            Console.WriteLine("I can fly with wings!");
        }
    }
    class FlyWithRockets:FlyBehavior {
        public void fly() {
            Console.WriteLine("Fly! With Rockets!");
        }
    }

    class duck {
    }

    class WoodDuck : duck {
        FlyBehavior WFB;
        public WoodDuck() {
            WFB = new FlyWithWings();
        }
        public void DuckFly(){
            WFB.fly();
        }
    }
}