S = input()
L = len(S)

wcnt = [0] * L
ans = 0
for i in range(L-1, -1, -1):
    if i != L-1:
        wcnt[i] = wcnt[i+1]
    if S[i] == 'w':
        wcnt[i] += 1
    elif S[i] == 'c':
        ans += wcnt[i] * (wcnt[i]-1) // 2
print(ans)