The challenge for 11/17/2014.
You are given a list of strings that are made up of letters and numbers. Sort them first according to the letters and then according to the numbers.
If you have an array of the following values a1, b1, a20, a2, a12, c5
Sort them so they are sorted first by letter and then by number like: a1, a2, a12, a20, b1, c5