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

    val sum = Array.fill(s.length + 1)(0)
    for (i <- s.length-1 to 0 by -1) {
      val x = if (s(i) == 'w') 1 else 0
      sum(i) = sum(i+1) + x
    }

    var ans = 0L
    for (i <- 0 to s.length-1 if s(i) == 'c')
      ans += nck(sum(i), 2)

    println(ans)
  }
}