Sort files by name length in finder?

I want to be able to find all mp3 files with exactly 4 letters so i can highlight them and open them up in ITunes. How do I do this?

I recently copied mp3s from my iPod to my mac. These files are all labelled with 4 random letters (eg. WRXL) and only reveal the name of the artist and song once opened in iTunes. When I highlighted all the files and double clicked and most of them opened up iTunes and became properly labelled, however i am left with about 2000 songs with the weird labels. These files are scattered through different albums and artists, so i need to find a way to group them all together so i can open them at the same time.

Thanks for the help!