Feature Request - Inc Alpha

I used to use an EXIF tool from a camera I purchased, but lost it when I upgraded to win10. That app used <year created>_<month created><day created><alpha><alpha>

Where alpha was letters A thru Z by date - not folder. So like:
2017_1022AA
2017_1022AB
2017_1022AC
2017_1023AA
2017_1023AB
2017_1023AC
I would like to continuing using this scheme since I have like 15 years of photos using it.

If you can't do this by alpha, I would settle for <inc Nr> BY DATE. Renamer seems to increase by folder now.

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