You are given the head of a singly linked list. Your task is to determine the total number of nodes present in the linked list and return its length.
Example 1
Input: head = [1,2,3,4,5]
Output: 5
Explanation: The linked list contains 5 nodes, so its length is 5.
Example 2
Input: head = [10]
Output: 1
Explanation: The linked list contains only one node, so its length is 1.
Example 3
Input: head = [7,14,21,28]
Output: 4
Explanation: The linked list contains 4 nodes, so its length is 4.
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