U can't put a "-" symbol at an atm pin machine though; there isn't any button for it and even if there is I dont think they accept it to be put into the pin input screen cuz i know for a fact that only the numbers have anti-pin saving button systems behind them. And now its jus a screen so even better.

I do feel as if this sort of misses the point of a lambda function, which is to make code less dense and difficult to read.

and also the one of 431 other players :-)

My solution

189 chars

Only one solution possible in Python, currently the kata does not provide any alternative to learn about.
The upper bound is too strict, especially for a 6kyu kata.

100 chars

25 is feasible, maybe optimum

lol too

wow, it's clever

Bruteforce

I don't leverage the power of "in (iterable)" enough LOL