I would like to give some feedback about test 5 of the problem "Three words".
The answer may be True because the word "Hi" contains only alphabets, but you say False.
From: http://www.checkio.org/mission/three-words/solve/
HTTP_USER_AGENT:
Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36
Created at: 2015/02/14 10:16; Updated at: 2015/02/14 10:41