package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	var s string
	s = readLine()
	lenS := len(s)
	var wCount, ans int
	for i := lenS - 1; i >= 0; i-- {
		if s[i] == 'w' {
			wCount++
		} else if s[i] == 'c' && wCount >= 2 {
			ans += wCount * (wCount - 1) / 2
		}
	}
	fmt.Println(ans)
}

var rdr = bufio.NewReaderSize(os.Stdin, 1000000)
func readLine() string {
	buf := make([]byte, 0, 1000000)
	for {
		l, p, e := rdr.ReadLine()
		if e != nil {
			panic(e)
		}
		buf = append(buf, l...)
		if !p {
			break
		}
	}
	return string(buf)
}