Hello, can someone please guide me how I can do a consecutive as follows

TRL-A-001

TRL-A-002

TRL-A-003 ...... TRL-A-999

As I get 999, the same first letters appear and only change A to B and so on until it reaches Z

TRL-B-001

TRL-B-001

TRL-B-002

TRL-B-003 ...... TRL-B-999

And since I have a form where there are many records when TRL-Z-999 arrives it appears

TRL-AA-001 when it ends up to TRL-AZ-999 follow TRL-BA-001

I don't know if something like that can be done?