import java.util.ArrayList;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class PizzaMonitor {
    private final Lock lock = new ReentrantLock();
    private ArrayList<Pizza> pizzas = new ArrayList<>();

    public void leggTilPizza(Pizza ferdigPizza) {
        lock.lock();
        try {
            pizzas.add(ferdigPizza);
        } finally {
            lock.unlock();
        }
    }

    public ArrayList<Pizza> hentBestilling() {
        lock.lock();
        try {
            return pizzas;
        } finally {
            lock.unlock();
        }
    }


}

class Pizza {}