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Given a time (in 24-hour format) with missing digits marked as '?', we want to replace all of the question marks by the same digit (0-9) in such a way as to obtain the latest possible time. The earliest valid time is 00:00 and the latest valid time is 23:59.

Write a function: class Solution { public String solution(String T); }

that, given a string T, returns the latest valid time as a string in the format "HH:MM", where HH denotes an hour in a two-digit 24-hour format and MM denotes minutes in a two-digit format.

Examples:

1. Given T = "2?:?8", the function should return "23:38".

2. Given T = "1?:?2", the function should return "15:52".

3. Given T = "??:??", the function should return "22:22".

4. Given T = "06:34", the function should return "06:34".

5. Given T = "1?:33", the function should return "19:33".

Assume that:
T consists of exactly five characters; the third one is ':'; the others are digits (0-9) or '?';
there always exists a valid time obtained by substituting '?' with digits.

def solution(T):

"""