import Data.Functor
import Control.Monad
import qualified Data.ByteString.Char8 as B
import Data.Maybe

readInts :: B.ByteString -> [Int]
readInts s = fst <$> mapMaybe (B.readInt) (B.words s)

main :: IO ()
main = (map readInts) <$> B.lines <$> B.getContents >>= putStrLn . show