`late_clock` function receive an array with 4 digits and should return the latest time that can be built with those digits.
The time should be in `HH:MM` format.

Examples:
```
[1, 9, 8, 3] => 19:38
[9, 1, 2, 5] => 21:59
```

You can suppose the input is correct and you can build from it a correct 24-hour time.

Difficulty: EASY
Starter code: def late_clock(digits):
	

Solutions:
from itertools import permutations

def late_clock(digits):
	for p in permutations(sorted(digits, reverse=True)):
		if p[0] > 2 or (p[0] == 2 and p[1] > 3) or p[2] > 5:
			continue
		return '{}{}:{}{}'.format(*p)


def late_clock(digits):
	(res, digits) = ([], digits[:])

	def rec(i):
		if i == 3:
			res.append(digits.pop())
			return True
		maxi = 2 if i == 0 else 5 if i == 2 else 3 if res[0] == 2 else 9
		for x in range(maxi, -1, -1):
			if x in digits:
				res.append(digits.pop(digits.index(x)))
				if rec(i + 1):
					return True
				digits.append(res.pop())
		return False
	rec(0)
	return '{}{}:{}{}'.format(*res)


from itertools import permutations

def late_clock(digits):
	for combo in permutations(sorted(digits, reverse=True)):
		if combo[:2] < (2, 4) and combo[2] < 6:
			return '{}{}:{}{}'.format(*combo)


from itertools import permutations

def late_clock(digits):
	return max((f'{a}{b}:{c}{d}' for (a, b, c, d) in permutations(digits) if 0 <= a * 10 + b < 24 and 0 <= c * 10 + d < 60))


def late_clock(digits):
	result = ''
	minute = '_'
	lessSix = 0
	digits = sorted(digits, reverse=True)
	for d in digits:
		if d < 6:
			lessSix += 1
	for d in digits:
		if d < 3:
			if lessSix < 3 and d == 2:
				continue
			result += str(d)
			digits.remove(d)
			break
	for d in digits:
		if d < 4 and result == '2' or (d < 10 and result != '2'):
			result += str(d) + ':'
			digits.remove(d)
			break
	for d in digits:
		if d < 6:
			minute = str(d)
			digits.remove(d)
			break
	result += minute + str(digits.pop())
	return result


from itertools import permutations

def late_clock(digits):
	return '{}{}:{}{}'.format(*max((c for c in permutations(digits) if c[:2] < (2, 4) and c[2:] < (6, 0))))


from itertools import permutations

def late_clock(digits):
	mx = max((t for t in [''.join(p) for p in permutations(''.join((str(d) for d in digits)))] if t[:2] < '24' and t[2:] < '60'))
	return '{}:{}'.format(mx[:2], mx[2:])


from itertools import permutations

def late_clock(digits):
	decreasing_combos = permutations(sorted(digits, reverse=True))
	max_combo = next((c for c in decreasing_combos if c[:2] < (2, 4) and c[2] < 6))
	return '{}{}:{}{}'.format(*max_combo)


from itertools import *
from datetime import *

def late_clock(digits):
	dt = []
	for (a, b, c, d) in permutations(digits, 4):
		try:
			dt.append(datetime.strptime(f'{a}{b}:{c}{d}', '%H:%M'))
		except:
			pass
	return max(dt).strftime('%H:%M')


from datetime import datetime as dt
from itertools import permutations

def late_clock(a):
	li = []
	for i in permutations(list(map(str, a))):
		try:
			d = dt.strptime(f"{''.join(i[:2])}:{''.join(i[2:])}", '%H:%M')
		except:
			continue
		li.append(d)
	return str(min(li, key=lambda x: dt.now() - x))[11:16]