#!/usr/bin/env python3
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
i, j = 0, 0
while i < len(c):
    while j < len(w) and w[j] < c[i]:
        j += 1
    n = len(w) - j
    ans += n * (n-1) // 2
    i += 1
print(ans)