I had exactly the same problem. I don´t know why the coordinates are upside down, but worse than that, test case number 1 works by mere chance if you do it the wrong way.

but there is no backslash there

I had a problem with the "'123" case. According to my computer, you can´t do int ("'123") and thus my function returned False, but according to codewars it returns True. This was before i realized the method "isdigit" exists and I tried to do it with try and except with int(pin).