For Ada, you can request new languages on Codewars runner board.
D is supported in kumite, but not in kata. There's also a related issue, so you could ask there about progress and further plans.

There is a plan to add Ada and D to katas? I saw before that there's the D compiler in beta, but I have seen that for many months.

In python you can do exponentiation with "**" or you can multiply the variable you want by itself(var * var)

Is unecessary to store the string again, you have convert it