Vista - Need help with extracting 4 digits from the directory/folder name

I have a variable folderP set to various paths values. I need to
extract the 2nd, 3rd, 4th and 5th charcters from it as explained with
an example below.

Here's the code i use:
-------------------------------
folderP=Application.PrimaryDirectory
For Ex.
folderP is set to C:\temp\21070Ax12K7. I need the 1070 from that
value.

Another Ex.
folderP set to Z:\NPBDArchive\PCDesign\ajackr\21062Axp22k745 - in
this case I need to extract the value 1062.

Also the primary directory names always start with a 2 followed by 4
digits and then an A. Is there a good way to get these values.


Thanks