static void Main(string[] args)
        {
            Lamp lamp = new Lamp();
            lamp.TurnOnLight();
            lamp.ReplaceBulb(30);
            lamp.GetState();

            Console.WriteLine();

            DeskLamp deskLamp = new DeskLamp(25, Place.Chair, true);
            deskLamp.GetState();
            deskLamp.MoveDeskLamp(Place.Floor);
            deskLamp.GetState();

            Console.WriteLine();

            LigthSource[] allLamps = { lamp, deskLamp };

            foreach (LigthSource l in allLamps)
            {
                (l as Lamp).ReplaceBulb(50);
                if (l is DeskLamp)
                {
                    (l as DeskLamp).MoveDeskLamp(Place.Table);
                }
                l.TurnOffLight();
                l.GetState();
                Console.WriteLine();
            }
        }