import Control.Arrow
import Control.Monad
import Data.List
import qualified Data.ByteString.Char8 as B

main :: IO ()
main = getLine >>= putStrLn . solve

solve :: String -> String
solve ss = judge . length $ filter (== 'o') ss
    where
        k = length ss

        judge n
            | 15 - k + n < 8 = "NO"
            | otherwise = "YES"

readLine :: IO [Int]
readLine = unfoldr (fmap (second (maybe B.empty snd . B.uncons)) . B.readInt) <$> B.getLine

readContents :: Int -> IO [[Int]]
readContents = flip replicateM readLine