# -*- coding: utf-8 -*-

### 文字列全体に含まれるチワワ列の総数を求める ###

def nC2(n):
    return n * (n - 1) // 2

S = input()
N = len(S)

# w[i] = 区間[i, N]に含まれる'w'の個数
w = [0] * (N + 1)
for i in range(N)[::-1]:
    w[i] += w[i+1]
    if S[i] == 'w':
        w[i] += 1

sm = 0
for i in range(N-1):
    if S[i] == 'c':
        sm += nC2(w[i+1])
print(sm)