The XML Depth Weaver

Given a simplified XML-like string using tags like '(tag)' and '(/tag)', determine the maximum nesting depth and the name of the tag at that depth. If multiple tags exist at the same maximum depth, return the one that appeared first. If the tags are improperly nested (mismatched), print 'INVALID'. Input: A single string of tags. Output: The tag name and its depth (0-indexed) separated by a space, or 'INVALID'. Example: Input: (root)(a)(/a)(b)(c)(/c)(/b)(/root) Output: c 2 (Explanation: 'root' is depth 0, 'a' and 'b' are depth 1, 'c' is depth 2.)