Series of alphabets

Hi All,

My requirement is that i have n no of documents e.g

ZZ250704

ZZ250711

ZZ250712.......up to n

Start assigning FLX number suffixesu2026

ZZ250704 --- would get the letter A So the document ZZ250704 will be attached to FLX9999A

ZZ250711 --- would get the letter B So the document ZZ250711 will be attached to FLX9999B

ZZ250712 --- would get the letter C So the document ZZ250712 will be attached to FLX9999C

Skip the letters I and O.. So it would be A-Z without I & O. If more letters are needed, Use AA - AZ, again skipping I & O, next series would be BA-BZ, CA-CZ, DA-DZu2026 ZA-ZZ.

Suggestions are most welcome........

Thanks,

Ruchi Tiwari