I am creating a unique identifier that is 11 characters long. What I want to do is start out with 00000000001 go to 00000000009 then start with 0000000000A to 0000000000Z after I hit Z then I would use the next column 00000000011 to 00000000019 then 0000000001A to 000000000001Z. How would I go about accomplishing this? I know how to increment letters and numbers separately but how would I put this all together?