returning a list of symbols after sorting...not values

"by".found it :) : (let (A 1 B 2 C 3) (by val sort '(C A B))) -> (A B C)

returning a list of symbols after sorting...not values

I'm sure I've seen an example of this but can't find it. e.g. ( let (A 1 B 3 C 2) (let L1 (list A B C) (let L2 (sort L1. but getting A B & C in order not 1 2 3 Any help much appreciated