class Yukicoder
  def initialize
    s = gets.chomp
    w_count = 0
    answer = 0

    s.reverse.chars do |ch|
      if ch == 'w'
        w_count += 1
      elsif ch == 'c' && w_count >= 2
        answer += (w_count * (w_count-1))/2
      end
    end

    puts answer
  end
end

Yukicoder.new