# 1323. Maximum 69 Number """ you are given a positive integer 'num' consisting only of digit 6 and 9. return the maximum number you can get by changing at most one digit. (6 becomes 9, and 9 becomes 6). """ class Solution(object): def maximum69Number(self, num): """ :type num: int :rtype: int """ return int(str(num).replace("6", "9", 1)) if __name__ == "__main__": obj = Solution() print(obj.maximum69Number(9669)) print(obj.maximum69Number(9996)) print(obj.maximum69Number(9999))