I've got a array that I need sorted in a certain way and I'm struggling to figure out how to make it happen the way I want. 

Basically the array needs to be sorted like this: 

[A, B, C, AA, AB, AF ]

that is, a single alpha character before it sorts the next character. However, what I end up with when I sort is: 

[A, AA, AB, AF, B, C]

How would I sort A to Z then AA-ZZ? 

Wayne