You havethe answers that you need. But for future reference for posting questions here, here are a few hints.

Keep your data short. If you can demonstrate what you need with 5 lines of data then any more is obscuring your point and people will stop reading your question.

Generally we like to see some code to see that you have had a try at solving the problem.

If you absolutly must include a huge amount of data then put it in readmore tags (see Writeup Formatting Tips).

Although your code and data generally show a problem, it is always good to describe your problem in words so that we understand where you are coming from. In this case you could have posted something like:

I have a problem sorting some data that is mixed numbers and letters. At the moment I am using sort but the result is like this:

K-2-D-19A

K-2-D-1D

K-2-D-20A
K-2-D-20B

K-2-D-2I
K-2-D-2J
[download]

and I would like it to be like:

K-2-D-1D

K-2-D-19A

K-2-D-2I
K-2-D-2J

K-2-D-20A
K-2-D-20B
[download]

How do I do that?