class Element {

   private Object data;
   private Element next;


   public Element (Object d, Element link) {

      data = d;
      next = link;
   }


   public Element add(Object d) {

      return new Element (d, this);
   }


   public void append (Object d) {

      Element t = this;
      while (t.next != null) t = t.next;
      t.next = new Element(d,null);

   }


   public void print () {

      Element t = this;
      while (t != null) {
         System.out.print (t.data + " ");
         t = t.next;
      }
   }


}


class List1 {

  public static void main (String[] args) {

    Element top = new Element(" Hello ", new Element(" world. ", null));
    top = top.add(" world. ");
    top = top.add(" Bye bye ");
 
    top.print();

  }

}