folderaction move files to diff folder depending on part of filename

All,

I was trying to create a script in Automator but didn’t work out as I would. Maybe someone can help me out?
Here’s what I want to do:

I have a bunch of files who I want to drop in one hotfolder. Some files have filenames starting with a digit (mostly with digit ‘4’), others start with ‘P’, ‘S’ or ‘N’. The files starting with number 4 needs to be moved into one folder (named OLD). The files starting with the letter ‘N’, ‘P’ or ‘S’ I like them to be moved to the folder ‘NEW’.

Anyone who can help me out on this one?

thnx