def time_converter(time):
    [time, apm] = time.split(" ")
    time_int = int(time.replace(':', ''))
    if apm == "a.m.":
        if time_int < 1200:
            return time.rjust(5, "0")
        else:
            [hours, minutes] = time.split(":")
            return "00:{}".format(minutes)
    else:
        if time_int < 1200:
            [hours, minutes] = time.split(":")
            return "{}:{}".format(int(hours) + 12, minutes)
        else:
            return time


if __name__ == '__main__':
    print("Example:")
    print(time_converter('12:30 p.m.'))

    # These "asserts" using only for self-checking and not necessary for auto-testing
    assert time_converter('12:30 p.m.') == '12:30'
    assert time_converter('9:00 a.m.') == '09:00'
    assert time_converter('11:15 p.m.') == '23:15'
    print("Coding complete? Click 'Check' to earn cool rewards!")