Hi, I didn't make the Swift translation (which I assume is the one with the one with the Dot) you're commenting; yet, I checked the code, and found this in the preloaded code for the kata:

enum Dot: Int {
	case a = 0, b, c, d, e, f, g, h, i
}

Hope that helps with your doubt, but as I don't code in Swift, I wouldn't be sure if that's what you're looking for.

I guess this kind of assessment is rather subjective: if you are good with regex, several katas using them would feel like they are 1-2 kyu too higher for you, but for most devs they are not such a piece of cake.

Judging from the sheer number of users who add troubles completing it and that 7 kyu should be really a beginner-ish kata, I might beg to differ.