<p>Given an array <code>nums</code> of integers, return how many of them contain an <strong>even number</strong> of digits.</p> <p> </p> <p><strong>Example 1:</strong></p> <pre> <strong>Input:</strong> nums = [12,345,2,6,7896] <strong>Output:</strong> 2 <strong>Explanation: </strong>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. </pre> <p><strong>Example 2:</strong></p> <pre> <strong>Input:</strong> nums = [555,901,482,1771] <strong>Output:</strong> 1 <strong>Explanation: </strong> Only 1771 contains an even number of digits. </pre> <p> </p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= nums.length <= 500</code></li> <li><code>1 <= nums[i] <= 10<sup>5</sup></code></li> </ul>