#coding: utf-8
##yuki_346

def combi(n):
 return n*(n-1)/2

s=list(raw_input())
n=len(s)

sw=[0 for i in xrange(n+1)]
for i in xrange(n-1,-1,-1):
 sw[i]+=sw[i+1]
 if s[i]=='w':
  sw[i]+=1

res=0
for i in xrange(n-1):
 if s[i]=='c':
  res+=combi(sw[i+1])

print res