import math._

object Main {
  def nck(n: Long, k: Long): Long = {
    var nume = 1L
    var deno = 1L
    for (i <- 1L to k) {
      nume *= n - i + 1
      deno *= i
    }
    nume / deno
  }

  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in)
    val s = sc.next

    var w = 0
    var ans = 0L
    for (i <- s.length-1 to 0 by -1) s(i) match {
      case 'w' => w += 1
      case 'c' => ans += nck(w, 2)
      case _ =>
    }

    println(ans)
  }
}