public class Exercise12 {
    
    public static void main(String[] args) {
        Book book1 = new Book("XXX", 3500);
        Book book2 = new Book("YYY", 2000, "B5");
        Book book3 = new Book("ZZZ", 2500);
        
        Person person = new Person("P");

        person.buy(book1);
        person.show();

        person.buy(book2);
        person.show();
        
        person.buy(book3);
        person.show();
    }
}