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import Prelude
import Text.Read
import Data.Maybe
import Data.List
import Data.Monoid
import System.Environment
digits = ["one","two","three","four","five","six","seven","eight","nine"]
parse [] = (mempty,mempty)
parse l@(x:xs) = case findIndex (`isPrefixOf` l) digits of
Just i -> f (Just $ i+1) <> parse xs
Nothing -> f (readMaybe [x]) <> parse xs
where
f = (,) . First <*> Last
add (First x, Last y) = (+) . (*10) <$> x <*> y
main = head <$> getArgs >>= readFile >>= print . sum . catMaybes . map (add . parse) <$> lines
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