• Is it a bug or my mistake?

 

I would like to give some feedback about ...

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

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Hi! assert checkio("One") == "e", "All letter only once." assert checkio("abe") == "a", "All letter only once." Why in the second test right result is "a" (first character in letter), but in the first test is "e" (last character in letter). I don't understand... Is it a bug?