Sequential ID numbers with non numeric charcters

I want to make unique ID numbers for a tiling layout. The horizantal position will be described with numbers and the vertical position will be described with charcters. Since there are a bit more then 300 rows I think two letters would be enough for the vertical identification. So the first row woul look like this : AA000, AA001, AA002…
the second row : AB000,AB001, AB002… and so on.
My problem is how can I make a sequence from non numeric characters?

With the Char Sequence component. Just remove the first 26 values in the sequence and you’ll get to the double-char ones.

Implementation of what @DavidRutten explained: (18.1 KB)


Thanks a lot guys!