let stream_fold f stream init =
  let result = ref init in
  Stream.iter (fun x -> result := f !result x) stream;
  !result



let count_bw () =
  let read_bw lno =
    if lno >= 8 then None
    else
      let cnt = read_line () |>
                Str.split (Str.regexp_string "") |>
                List.filter (fun s -> s = "b" || s = "w") |>
                List.length
      in
      Some(cnt)
  in
  stream_fold ( + ) (Stream.from read_bw) 0

let solve s bw_cnt =
  let rev_player = function | "oda" -> "yukiko" | _ -> "oda" in
  if bw_cnt mod 2 = 0 then s
  else rev_player s

let () =
  let s = read_line ()
  and bw_cnt = count_bw ()
  in
  solve s bw_cnt |> print_endline