package main

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

var sc = bufio.NewScanner(os.Stdin)

func Scanner() string {
	sc.Scan()
	return sc.Text()
}
func main() {
	buf := make([]byte, 0)
	sc.Buffer(buf, 100000007)
	sc.Split(bufio.ScanWords)
	s := Scanner()

	ans := 0
	count := 0
	for i := 0; i < len(s); i++ {
		if s[i] == 'w' {
			count++
		}
	}
	for i := 0; i < len(s); i++ {
		if s[i] == 'c' {
			ans += count * (count - 1) / 2
		}
		if s[i] == 'w' {
			count--
		}
	}
	fmt.Println(ans)
}