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 <= 500`
- `1 <= nums[i] <= 105`