public class billettBruk{
    public static void main(String[] args) {
        concertTicket billett = new basicConsertTicket();

        System.out.println(billett.getDiscription());
        System.out.println(billett.getCost());

        billett = new VIPspot(billett);

        System.out.println(billett.getDiscription());
        System.out.println(billett.getCost());
    }

}