def up_array(arr):
    if not arr or min(arr) < 0 or max(arr) > 9:
        return None
    else:
        return [int(y) for y in str(int("".join([str(x) for x in arr])) + 1)]

a599d8c0c7ba6b2c69492828bb681b7232cb0caa
<mask token>

def up_array(arr):
    if not arr or min(arr) < 0 or max(arr) > 9:
        return None
    else:
        return [int(y) for y in str(int(''.join([str(x) for x in arr])) + 1)]

def up_array(arr):
    if not arr or min(arr) < 0 or max(arr) > 9:
        return None
    else:
        return [int(y) for y in str(int("".join([str(x) for x in arr])) + 1)]
