defmodule Main do
  def main do
    IO.read(:line)
    |> String.trim()
    |> solve
    |> IO.puts()
  end

  def solve(s) do
    s
    |> String.to_charlist()
    |> solve_rec(0, 0, 0)
  end

  def solve_rec([], _a, _ab, abb) do
    abb
  end

  def solve_rec([h | t], a, ab, abb) when h == ?c do
    solve_rec(t, a + 1, ab, abb)
  end

  def solve_rec([h | t], a, ab, abb) when h == ?w do
    solve_rec(t, a, ab + a, abb + ab)
  end

  def solve_rec([_h | t], a, ab, abb) do
    solve_rec(t, a, ab, abb)
  end
end