public class Exercise22 {
    
    public static void main(String[] args) {
        Computer computer = new Computer("AAA", 100);
        computer.print();
        
        Laptop laptop = new Laptop("BBB", 150);
        laptop.print();
        
        computer = laptop;
        computer.print();
        
        computer = new Desktop("CCC", 200);
        computer.print();
    }
}