function rotateRight(head, k) {
  if (!head || !head.next || k === 0) {
    return head;
  }
  let tail = head;
  let length = 1;
  while (tail.next) {
    tail = tail.next;
    length++;
  }
  k %= length;
  if (k === 0) {
    return head;
  }
  tail.next = head;
  let stepsToNewTail = length - k - 1;
  let newTail = head;
  while (stepsToNewTail--) {
    newTail = newTail.next;
  }
  const newHead = newTail.next;
  newTail.next = null;
  return newHead;
}