3

# -*- coding: utf-8 -*-
 
__author__='Introfor'
 
import re, urllib2
 
url = "http://www.pythonchallenge.com/pc/def/equality.html"
response = urllib2.urlopen(url).read()
strings = response[response.rindex('<!--'):response.rindex('-->')]
 
result = "".join(re.findall(r"[^A-Z][A-Z]{3}([a-z])[A-Z]{3}[^A-Z]",strings))
 
print result