This question I got right but not in the concise way they were looking for. I wrote a python-like loop using a dummy variable "n" to grab the letters from the end in reverse order stopping after every character had been taken. The answer they were looking for was a function that grabbed the last letter of a string, then called the function within itself instead using a substring instead as a parameter, the substring being the same string with the last letter cut off. The stopping when the substring is empty.