static void Main(string[] args)
{
Duck robotDuck = new RobotDuck();
robotDuck.Fly();
robotDuck.Quack();
Duck normalDuck = new NormalDuck();
normalDuck.Fly();
normalDuck.Quack();
Duck modelDuck = new ModelDuck(new NoFlyStrategy(), new HighPitchQuackStrategy());
modelDuck.Fly();
modelDuck.Quack();
Console.ReadLine();
}