import Control.Monad (replicateM)

solve :: Int -> Bool -> String -> [Int]
solve i _ [] = [i]
solve i w (c:cs)
    | c == 'o' && w == False = solve 1 True cs
    | c == 'o' && w == True = solve (i + 1) True cs
    | c == 'x' && w == True = [i] ++ solve 0 False cs
    | otherwise = solve 0 False cs

main = replicateM 2 getLine >>= print . maximum . solve 0 False . concat