• bug on accepted code?

I would like to give some feedback about ...

From: http://www.checkio.org/mission/most-wanted-letter/solve/


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I am using the code below

from collections import Counter

text = 'one' arr = list(text)

arr=filter(lambda x:x.islower(),arr)

print Counter(arr).most_common(1)[0][0]

which it will yield the correct result 'e', but on the editor on checkio it will show the result of my code is 'n'