class Q {
    boolean val = false;

    synchronized void values(int n) {
        if (!val){
            try {
                wait();
            } catch (Exception e) {}
        }
        for (int i = n; i < n+5; ++i) System.out.println(i);
        val = false;
        notify();
    }

    synchronized void text(String s) {
        if (val)
            try {
                wait();
            } catch (Exception e) {}
        System.out.println(s);
        val = true;
        notify();
    }
}

class producer implements Runnable {
    Q q;
    Thread t;
    boolean live;

    producer (Q q) {
        live = true;
        Thread t = new Thread(this);
        this.q = q;
        t.start();
    }

    public void run () {
        q.text("BEFORE");
        q.text("AFTER");
    }
}

class consumer implements Runnable {
    Q q;
    Thread t;
    boolean live;

    consumer (Q q) {
        live = true;
        t = new Thread(this);
        this.q = q;
        t.start();
    }

    public void run () {
        q.values(0);
        q.values(5);
    }
}

public class app {
    public static void main(String args[]) {
        Q q = new Q();
        new producer(q);
        new consumer(q);
    }
}