import bisect
S = input()
c = []
w = []
for i in range(len(S)):
  if S[i] == "c":
    c.append(i)
  elif S[i] == "w":
    w.append(i)

ans = 0
for c_idx in c:
  w_idx = bisect.bisect_left(w, c_idx)

  num = len(w) - w_idx
  if num >= 2:
    ans += num * (num - 1) // 2

print(ans)