I agree. The kata lacks specifications. For example we don't know what should be done with non-alpha-numeric characters, it's not enough with removing them (and this is not even in the description). There is a margin between giving the code and asking the user to play charades from the random tests results to understand what must be done: The description should clearly state all requirements the user is expected to fulfill to complete the kata.

I don't feel that as an issue; the best thing to do would be a complete explanation... or to give the code:-) Don't you think that a bit of work is needed for a 5 kyu.

Not an issue