Way of counting the characters in a text frame in InDesign

Hello all, I’m attempting to find a way to pick out the first text frame of a document which has under a certain level characters.
I’ve tried just about every variation I can think of of

set LotNum to first text frame of active document whose (length of characters < 3)

,

set LotNum to first text frame of active document whose (count of characters of contents < 3)

and

set LotNum to first text frame of active document whose (length of characters of text 1 < 3)

I can think of and just can’t find the right combination for it to do what I want

Any thanks in advance for any help the community can offer

Hi. This is one way.

tell application "Adobe InDesign CS3"'s document 1 to try
	(stories whose length < 3)'s item 1's contents as text
on error
	"No"
end try