str1 = 'There is a tree behind the house.'[:-1].split()
str2 = 'A big tree is cut down there.'[:-1].split()
n = 0
togeter = []
for i in str1:
if i in str2:
togeter.append(i)
for max_word in togeter:
if len(max_word) < n:
n = len(max_word)
max_word= n
print max_word
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