Easy Python Solution
Code\n\nclass Solution:\n    def findMaxK(self, nums: List[int]) -> int:\n        nums.sort()\n        for i in nums[::-1]:\n            if -i in nums:\n       
# Code\n```\nclass Solution:\n    def findMaxK(self, nums: List[int]) -> int:\n        nums.sort()\n        for i in nums[::-1]:\n            if -i in nums:\n                return i\n        return -1\n```
['Python', 'Python3']