Your result: "s"

Right result: "k"

Fail: checkio("fn;lsfndasl;f naslkdnlkasdnfslahwemwjkrjkl;zcmk;lzcdkcslksdkseewme,")

Truly saying, I dont understand, why letter "k" is right answer for this input. "s" and "k" both appears 8 times in a text but last "s" if far then last "k", so "s" should be the correct result, isnt it?