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Given a singly linked list of size **N**. The task is to **left-shift** the linked list by **k** nodes, where **k** is a given positive integer smaller than or equal to length of the linked list.

**Example 1:**

Input:N = 5 value[] = {2, 4, 7, 8, 9} k = 3Output:8 9 2 4 7Explanation:Rotate 1:4 -> 7 -> 8 -> 9 -> 2Rotate 2:7 -> 8 -> 9 -> 2 -> 4Rotate 3:8 -> 9 -> 2 -> 4 -> 7

**Example 2:**

**Input:
**N = 8
value[] = {1, 2, 3, 4, 5, 6, 7, 8}
k = 4
**Output: **5 6 7 8 1 2 3 4

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **rotate**() which takes a **head **reference as the **first argument **and **k** as the **second argument, **and returns the head of the rotated linked list.

**Expected Time Complexity: **O(N).

**Expected Auxiliary Space: **O(1).

**Constraints:**

1 <= N <= 10^{3}

1 <= k <= N

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Rotate a Linked List

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