static int trav(int key, node root) {

		if (root == null) {
			return 0;
		}

		if (root.left != null) {

			trav(key, root.left);

		}
		if (root.right != null) {
			trav(key, root.right);

		}
		if (root.right == null && root.left == null) {
			System.out.println("Key " + root.key);

		}
		return root.key;
	}