import sys, math
sys.setrecursionlimit(10**8)
sys.set_int_max_str_digits(0)

S = input()
T = []
for s in S:
    if s == 'c':
        T.append(0)
    elif s == 'w':
        T.append(1)
N = len(T)

if N == 0:
    exit(print(0))

rT = T[:]
for i in range(N - 1, 0, -1):
    rT[i - 1] += rT[i]

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

ans = 0
for i in range(N):
    if T[i] == 0:
        ans += f(rT[i])

print(ans)