s = raw_input()
sumw = [0] * (len(s) + 1)
for i in xrange(len(s)):
  sumw[i + 1] = sumw[i] + (s[i] == "w")
ans = 0
for i in xrange(len(s)):
  if s[i] != "c":
    continue
  x = sumw[len(s)] - sumw[i + 1]
  ans += x * (x - 1) / 2;
print ans