static void Main(string[] args)
        {
            WidescreenTV tv = new WidescreenTV();

            tv.TurnOn();
            tv.IncreaseVolume();
            tv.DecreaseVolume();
            tv.TurnOff();
            TV tv2 = new TV();

            tv2.TurnOn();
            tv2.IncreaseVolume();
            tv2.DecreaseVolume();
            tv2.TurnOff();
            Console.ReadLine();
        }