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armanbilge/leastFrequentLetters.py

Last active August 29, 2015 14:15
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leastFrequentLetters.py
import string
from collections import Counter
def leastFrequentLetters(s):
C = Counter(c for c in s.lower() if c in string.ascii_lowercase)
return ''.join(k for k in string.ascii_lowercase if C[k] == min(C.itervalues()))
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