Wow I like how cleverness of this solution does not kill the readability.
Bravo!

Yea I also like the use of Math.min and Math.max.
It is clever.

I found the problem.
It turned out argument provided by the test had trailing space which is not easy to spot.
So technically it is my bad.

I did. I cannot see anything that could help.
I copied test arguments from "Attempt" and pasted them into Sample Tests.
So again the SAME test passes at "Test" and fails at "Attempt".

Locally in IDE it also passes.

I do not hit max call stack or something similar. I've checked already all points from the documentation.