S = [x for x in input() if x == "c" or x == "w"]

limit = 100000
fact = [1] * (limit + 1)

for i in range(2, limit + 1):
    fact[i] = fact[i - 1] * i


def nCk(n, k):
    if k > n:
        return 0
    return fact[n] // (fact[n - k] * fact[k])


ans = 0
w = 0

for s in S[::-1]:
    if s == "w":
        w += 1
    else:
        ans += nCk(w, 2)
print(ans)