let R() = stdin.ReadLine()

type Turn = FstPlayer | SndPlayer
let (|Oda|Yukiko|) = function | x when x = "oda" -> Oda | _ -> Yukiko
let (|Odd|Eve|) n  = match n % 2 with | 1 -> Odd | _ -> Eve

let playerName fstMove (turn:Turn) =
    match fstMove, turn with
    | Oda, FstPlayer 
    | Yukiko, SndPlayer 
        -> "oda"
    | _ -> "yukiko"
    
let judge (board:string[]) =
    let charaDist=
        board
        |> Array.map(fun x -> x.ToCharArray())
        |> Array.concat
        |> Array.countBy(fun x -> x)
        |> Map.ofArray
    let blackNum = charaDist |> Map.find 'b'
    let whiteNum = charaDist |> Map.find 'w'
    match abs(blackNum - whiteNum) with
    | Eve -> Turn.FstPlayer 
    | Odd -> Turn.SndPlayer

[<EntryPoint>]
let main _ =
    let GRID_NUM = 8
    let S = R()
    let B = Array.init GRID_NUM (fun _ -> R())
    judge B
    |> function
        | FstPlayer as t -> playerName S t
        | SndPlayer as t -> playerName S t
    |> printfn "%s"
    0