import Control.Monad

rInt :: String -> Int
rInt = read

split_char c [] = []
split_char c str = w : split_char c (case xs of "" -> []; _ -> tail xs)
    where
        (w, xs) = break (==c) str

solve [ks, vs]
    | ks == vs  = "YES"
    | otherwise = isKaseki ks vs
    where
        isKaseki [] []  = "YES"
        isKaseki (k:ks) (v:vs)
            | k > v     = "YES"
            | k < v     = "NO"
            | otherwise = isKaseki ks vs

main = do
    kvs <- map ((map rInt) . split_char '.') <$> replicateM 2 getLine
    putStrLn $ solve kvs
    print kvs