import java.util.Scanner;

public class Test {

    private static final Object LOCK = new Object();

    public static void main(String[] args) {
        final Thread thread = new Thread() {
            public void run() {
                while (true) {
                    synchronized (LOCK) {
                        System.out.println("Looped at: " + System.currentTimeMillis());
                        try {
                            LOCK.wait();
                        } catch (Exception ignored) {
                            ignored.printStackTrace();
                        }
                    }
                }
            }
        };
        thread.start();
        final Scanner in = new Scanner(System.in);
        while (true) {
            if (in.nextLine().equals("loop")) {
                synchronized (LOCK) {
                    LOCK.notifyAll();
                }
            }
        }
    }


}