Rearranging parts of a filename in title field

I have 76 files I need a batch solution for. The filenames are formatted like this:

A01a Artistry In Trumpets
A01b Artistry In Trumpets
A01c Artistry In Trumpets

A02a Juanita
A02b Jaunita

ect.

What I'd like to do is copy those names to the title field, with the first 5 characters cut, but I want to put the 4th character (the lowercase letter) at the end of the title in parentheses. So they look like this:

Artistry In Trumpets (a)
Artistry In Trumpets (b)
Artistry In Trumpets (c)

Juanita (a)
Juanita (b)

There has to be a way to do this.

Try an action of the type "Format value" for TITLE
Format string: $regexp(%_filename%,...(.) (.*),$2 \($1\))

That worked perfectly! Thank you!