package main

import (
	"fmt"
)

func main() {
	var s string
	fmt.Scan(&s)
	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)
}