import java.util.concurrent.locks.ReentrantLock;

public class Task250725 {
    public static void main(String[] args) {
        ReentrantLock lock = new ReentrantLock();
        try {
            lock.lock();
            System.out.println("First lock");
            lock.lock();
            System.out.println("Second lock");
        } finally {
            lock.unlock();
        }
    }
}