#coding: UTF-8

import sys
from math import log
from collections import deque
from functools import reduce

### defs ###

### main ###
S = sys.stdin.readline().strip('\r\n')
sz = len(S)
wc = [0]*sz
for i in range(sz-1,-1,-1):
	if (S[i]=="w"):
		wc[i]+=1
	if (i < sz-1):
		wc[i]+=wc[i+1]
ans=0
for i in range(sz):
	if(S[i]=='c'):
		x=wc[i]
		ans+=x*(x-1)//2
print(ans)