Lua code golf problem -

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i've been playing around code golf problem: https://www.spoj.pl/shorten/problems/kamil/

i've got solution down 55 characters:

 l in io.lines()do print(2^#l:gsub("[^tdlf]",""))end

now, shortest submitted solution in lua 47 characters long. can't figure out how further reduce mine , it's been driving me crazy. have hint me? i've tried working on io.read("*a") rid of loop didn't help.

lua (54 chars)

repeat print(2^#io.read():gsub('[^tdlf]',''))until nil

errors on completion, maybe not ok

otherwise spent while experimenting second return of gsub; seem gain 1 character return selecting.


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