[Bug] press other than romanji in Hiragana word recognition game cause wrong and lose a point.

I've found that when I press shift, it causes me to wrong in that question.

And then I saw the function call fCheckInput() and I think it would be better if check the actual keystroke on a-z instead checks all key in one loop because the loop may cause an error on other keys like 1 2 3 or shift.

Please check and fix it. Thanks.