whoNext :: String -> String -> String
whoNext s b
    | even n    = s
    | otherwise = if s == "oda" then "yukiko" else "oda"
    where
        n = length $ filter (\c -> (c == 'w') || (c == 'b')) b

main :: IO ()
main = do
    s <- getLine
    b <- getContents
    putStrLn $ whoNext s b