Adding brackets (or parentheses) to end character

[ohrenkino]

What have you done so far?
And why didn't you do it when you applied this procedure?

What am I doing wrong here? (i.e. inserting incremental letter)

I'm trying to insert an incremental letter on multiple files. For example: A04a Bongo Sounds A04b Bongo Sounds I would like to put a capital A at the end of the first file, a capital B at the end of the second file and so on. I'm using this string in filename - filename: $char($add($num(%1,1),65)) But all it does is place an "A" at the end of each file. Is the string not accurate? I don't want the same letter repeated for every file. I want the letter to adjust incrementally.