Turning a text in an alphabetical list of unique words

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Turns a text in an alphabetical list of unique words. Attempts to strip punctuation and lowercases everything.

#!/usr/bin/env python

import sys, string

words = {}
for line in sys.stdin:
    for word in line.split():
        word = word.lower().strip(string.punctuation)
        words[word] = words.get(word, 0) + 1

for word in sorted(words.keys()):
    print word,
print