object Main {

  def solve(s: String): Long = {
    var answer = 0
    var w = 0
    for (ch <- s.reverse){
      if (ch == 'w') {
        w += 1
      } else if (ch == 'c') {
        answer += w * (w - 1) / 2
      }
    }
    return answer
  }

  def main(args: Array[String]): Unit = {
    println(solve(scala.io.StdIn.readLine()))
  }

}