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#!/usr/bin/env python
from collections import Counter
def common_characters(words):
char_count = Counter(words[0])
for w in words:
current_count = Counter(w)
for c in list(char_count):
char_count[c] = min(char_count[c],current_count[c])
res = []
for char,count in char_count.items():
res.extend([char] * count)
return res
print(common_characters(["bella","label","roller"]))
print(common_characters(["cool","lock","cook"]))
print(common_characters(["hello","world","pole"]))
print(common_characters(["abc","def","ghi"]))
print(common_characters(["aab","aac","aaa"]))
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