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

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

solve :: String -> String
solve = f . null . filter (odd . length) . group . sort
  where
    f True = "Yes"
    f False = "No"

getl :: (String -> a) -> IO a
getl f = f <$> getLine
