You could use the len(), you overcomplicate things by NOT using it. just build a list called letters[] and drop all the letters you need, as strings. is WAY EASIER to do it like that and I'm sure beginners won't have trouble with it because believe me, you gonna use that as much as print() for this type problems.
Also, you could also introduce for loops easily. Instead of doing that WET example you could make a for loop and make the code more modular (so the user can play with) and also add an infinite number chr() instead of being limited to four. You may also need to create lists and empty list sooo, ok maybe I end up expanding it too much, soooo, yeah, the code is gud.
