s = raw_input()

arr = []

for i in s:
	if i == 'c' or i == 'w':
		arr.append(i)

cs = []
t = 0
for i in range(len(arr)):
	if arr[i] == 'w':
		t += 1

	cs.append(t)

ans = 0

for i in range(len(arr)):
	if arr[i] == "c":
		count = cs[len(arr)-1] - cs[i]
		ans += count * (count-1)/2

print ans