List - Replace Item At Index

hi all,
I’m trying to replace some numbers with Alphabets. I tried with level but I’m not getting the result that I want.
Red Color list is my required result.

I can’t recall if there was a way you can fiddle with the inputs to get that node working for inputs like yours, but Clockwork, Archilab, and perhaps other packages have versions of that node which will do what you want.

@Hamish
Yes, Archilab node works


Thanks