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
    s = input()
    f(s, 0, 0)
    |> IO.puts
  end

  def f(s, k, m) do
    case s do
      "" -> max(k, m)
      "yukicoder" <> t -> f(t, k+1, m)
      _ ->
        {_, t} = String.next_grapheme(s)
        f(t, 0, max(k, m))
    end
  end
end