I would like to give some feedback about ...
Handing back an int but the checker refuses to recognize it.
From: https://py.checkio.org/mission/days-diff/solve/
HTTP_USER_AGENT:
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36
Created at: 2016/12/29 20:04; Updated at: 2016/12/30 08:43
