Comment obtenir les mots de 5 lettres dans Python

word_site = "http://www.instructables.com/files/orig/FLU/YE8L/H82UHPR8/FLUYE8LH82UHPR8.txt"
response = urllib2.urlopen(word_site)
txt = response.read()
WORDS = txt.splitlines()
randomword=(random.choice(WORDS))
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