check function never finish.
I would like to give some feedback about the check code.
It run for eternity and never stop :/ my solution isn't the best, maybe slow. but it work :)
From: https://py.checkio.org/mission/express-delivery/solve/
HTTP_USER_AGENT:
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0
