private static LinkedList merge(LinkedList ls, LinkedList ls2) {
		Node temp1 = ls.getFirst();
		Node temp2 = ls2.getFirst();
		LinkedList ls3 = new LinkedList();
		while (temp1 != null && temp2 != null) {
			if ((Integer.parseInt(temp1.element.toString())) < (Integer.parseInt(temp2.element.toString()))) {
				ls3.addLast(temp1.element);
				temp1 = temp1.next;
			} else {
				ls3.addLast(temp2.element);
				temp2 = temp2.next;
			}
		}
		if (temp1 == null)
			temp1 = temp2;
		while (temp1 != null) {
			ls3.addLast(temp1.element);
			temp1 = temp1.next;
		}
		return ls3;
	}