@quint Impressive, but looks overly mathematical for the task... I'd stay with the slower solution for the sake of readability.
agreed. also an edge case test: ",,treat"
, is not alphabetical
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I would have deleted the first hint because it is not a hint at all. Can be easily misunderstood.
Hint #2 is normal.
I can't figure out how hint #1 relates to the solution.