import Control.Applicative ((<$>), (<*>))
import Control.Monad
import Data.List

main :: IO ()
main = do
  solve <$> getLine <*> getLine >>= print

solve :: String -> String -> Int
solve xs ys = maximum $ scanl' f 0 $ xs ++ ys
  where
    f n c = if c == 'o' then n + 1 else 0