package main

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

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

var sc = bufio.NewScanner(os.Stdin)

func nextLine() string {
	sc.Scan()
	return sc.Text()
}