class MyQueue {

    public MyQueue() {
    }

    public void enqueue (Object o) {
    }

    public Object dequeue () {        
    }
    /* dequeue should return null if queue is empty */
}

/*
public class QueueList {

  public static void main (String argv []) {

      int j;
      MyQueue que = new MyQueue();

      for (int i = 0; i < 100; i++) {
      j = (int) ( 200 * Math.random());
      if (j < 120) {
	  que.enqueue(new Integer(j));}
      else {
          System.out.println((Integer) que.dequeue());
      }
      }

  }
}
*/