fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end


fun countPieces board =
    let
        val grid = List.foldl (fn (s, acc) =>
                                  String.explode s @ acc)
                              []
                              board

        val black = List.foldl (fn (ch, acc) =>
                                   if ch = #"b" then acc + 1
                                   else acc)
                               0
                               grid

        val white = List.foldl (fn (ch, acc) =>
                                   if ch = #"w" then acc + 1
                                   else acc)
                               0
                               grid
    in
        (black, white)
    end


fun findAns sente black white =
    let
        val gote = if sente = "oda" then "yukiko"
                   else "oda"
    in
        if (black + white) mod 2 = 0 then sente
        else gote
    end


val () =
    let
        val s = readStr ()
        val board = List.tabulate (8, fn _ => readStr ())

        val (b, w) = countPieces board
        val ans = findAns s b w
    in
        print (ans ^ "\n")
    end