main = getLine >>= solve

solve :: String -> IO ()
solve n = getContents >>= putStrLn . ans . foldl ff True
	where
	ans x
		| x = n
		| otherwise = if n == "oda" then "yukiko" else "oda"
	ff acc x
		| x == 'b' || x == 'w' = not acc
		| otherwise = acc