s = input()

n = len(s)
W = [0 for _ in range(n)]
for i in range(n):
    if s[i] == 'w':
        W[i] += 1
for i in range(n - 1, 0, -1):
    W[i - 1] += W[i]

ans = 0
for i in range(n):
    if s[i] == 'c':
        ans += W[i] * (W[i] - 1) // 2
print(ans)