S = input()
N = len(S)
w_acc = [0]

for S_i in S:
    if S_i == 'w':
        w_acc.append(w_acc[-1] + 1)
    else:
        w_acc.append(w_acc[-1])

ans = 0

for i in range(N):
    if S[i] == 'c':
        w_cnt = w_acc[N] - w_acc[i+1]
        ans += w_cnt * (w_cnt - 1) // 2

print(ans)