import Data.List ( group )

main :: IO ()
main = do
    s <- getLine
    let t = dropWhile (<= 3) $ map length $ group s
        u = zip (map length $ group s) (group s)
    if null t then putStrLn "NA" else putStrLn $ f u
    where
        f :: [(Int, String)] -> String
        f (x:_) = if elem 'O' (snd x) then "East" else "West"