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() |> String.to_charlist
    ans = f(s, 0, 0)
    IO.puts ans
  end

  def f([], k, m), do: max(k, m)
  def f([?y, ?u, ?k, ?i, ?c, ?o, ?d, ?e, ?r | xs], k, m) do
    f(xs, k+1, m)
  end

  def f([_ | xs], k, m) do
    f(xs, 0, max(k, m))
  end
end