#coding: utf-8
##yuki_346
import scipy.misc as scm
 
s=list(raw_input())
sc=[]
sw=[]

for i in xrange(len(s)):
 if s[i]=='c':
  sc.append(i)
 elif s[i]=='w':
  sw.append(i)

res=0
for i in xrange(len(sc)):
 count=0
 for j in xrange(len(sw)):
  if sc[i]<sw[j]:
   count+=1
 res+=scm.comb(count,2,1)

print res