def nCk(n,k):
	x = 1
	for i in range(n,n - 1 - k,-1):
		x *= i
	y = 1
	for i in range(1,k + 1):
		y *= i
	return x / y
s = raw_input()
w = [0 for i in range(len(s))]
for i in range(len(s) - 1,-1,-1):
	if s[i] == 'w':
		w[i] += 1
for i in range(len(s) - 2,-1,-1):
	w[i] += w[i + 1]
ans = 0
for i in range(len(s)):
	if s[i] == 'c':
		ans += w[i] * (w[i] - 1) / 2
print ans