Given an array nums of integers, return how many of them contain an even number of
digits.
Example 1:
Input: nums = [12,345,2,6,7896]
Output: 2
Explanation: 12 contains 2 digits (even number of digits). 345 contains 3 digits (odd
number of digits). 2 contains 1 digit (odd number of digits). 6 contains 1 digit (odd
number of digits). 7896 contains 4 digits (even number of digits). Therefore only 12 and
7896 contain an even number of digits.
Example 2:
Input: nums = [555,901,482,1771]
Output: 1
Explanation:
Only 1771 contains an even number of digits.
Constraints:
1 <= nums.length <= 5001 <= nums[i] <= 10^5