S = input()
C = [0] * (len(S) + 1)
for i in range(len(S) - 1, -1, -1):
    C[i - 1] = C[i]
    if S[i] == "w":
        C[i - 1] += 1
ans = 0
for i in range(len(S)):
    if S[i] == "c":
        ans += C[i] * (C[i] - 1) // 2
print(ans)