Convert from numbers to letters

[rh0dium]

Hi All,

While I know there is a zillion ways to do this..  What is the most
efficient ( in terms of lines of code ) do simply do this.

a=1, b=2, c=3 ... z=26

Now if we really want some bonus points..

a=1, b=2, c=3 ... z=26 aa=27 ab=28 etc..

Thanks