defmodule Main do
  def input, do: IO.read(:line) |> String.trim
  def ii, do: input() |> String.to_integer
  def li, do: input() |> String.split |> Enum.map(&String.to_integer/1)
  def yn(b), do: IO.puts(if b, do: "Yes", else: "No")

  def main do
    [a, b] = li()

    x = a * 1000
    y = b * 60 * 60
    cond do
      x > y -> "KoD"
      x < y -> "blackyuki"
      true -> "same"
    end
    |> IO.puts
  end
end