It best fits under the 7 kyu description, which is:

Iterating arrays and returning a subset of values
Basic data type manipulations
Common operations such as sorting (using built-in sorting methods)

8 kyu kata are usually much simpler, dealing with stuff like simple function definitions, basic variable assigments, basic math operations, and basic syntax fixes

Why is this a 7 kyu kata? It's a really basic one....

I was excited because my two first tests passed but the third one! I do not get it, why if the String is reversed, I get it reversed when sorted :S LOL. Any help?