• The Most Wanted Letter Misson Error

 

Sorry for my English. My code:

def checkio(a):
    b = a.lower()
    d = {i : b.count(i) for i in b.lower() if i.isalpha()}
    m = max(d, key=d.get)
    return min(d) if m == 1 else m

I tried on Output (Python console), and the result is exactly. But when I run the test, It's wrong.

Created at: 2015/12/28 02:11; Updated at: 2015/12/29 17:19
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hinh