they were?

real.

Not a kata suggestion

its really a 8 kyu problem because it requires a basic knowledge about characters

Then why do you keep doing them? Skip them if you don't like them, nobody forces you to do them. Seriously, what's the "obscure formula" you had to google here?

I disagree with you, that's not the only way to solve this kata. And some solutions don't need "obscure" formulas at all.

It is a puzzle, I think description is fine as it is.

list comprehension

Added regex tag for the Kata

why?

• do not spoil the solution for other users
• nowadays, people can just ask chatGPT or Google for the answer. it's a very well known and searchable result.

You can do each operation per line saving each result to a variable, and ocne it works refactor to single line eliminating all variables.