MY POOR WEBBROWSER !!

Do not show 1 000 it-headers.

Unrelated, do not rely on random tests only ( these issues may not be unique to this translation ).

The general rule of thumb (at least on Codewars) is to not mutate the input unless it's explicitly instructed to do so.

@yuskivpm -- This is happening because your solution is mutating the input. The final tests ensure this isn't a problem, but the sample tests do not.

I do not have the "pos" variable in the code, so the problem is definitely not with my code))

I am just nitpicking and being totally unhelpful, but it still could be a symptom of a problem with your code. pos could be the answer returned by your solution, which is expected to be iterable, but it happens to be not.