Hello Tomasz, nice to see you already started to play with Codewars :) Hope you enjoy it! :) Keep my fingers crossed.

#import string
from string import ascii_lowercase as letters, ascii_uppercase as ucase_letters

above code caused error --> NameError: global name 'string' is not defined

interesting way of showing to author, that random tests are missing :)

Strange, hard to read, hard to code, far too muuuuuuch text to deal with, far too long for scrolling it. If then, it should be shorted radically!

In my honest opinion creating class to solve such a simple problem is superfluous and unresonable. Why not just implement simple function for simple operation?

It could be interested, if You try to find some resonable usage of class like object initialization, usage of self or something... But now, with such defined conditions, implementing class has no sense and no rational relation with problem solving. It is just because it is, without any sense.

I had some problems with correct result, until I carefully read whole description :) Nice kata! Thx :)

sorry for spoiler... and thanks for quick reaction :)

The description is unfinished... for me list of the output columns is missing. It isn't directly said, that description is groupping element. I have to guess it with test errors.