import math
f = math.factorial
s = input()
l = [x for x in s if x in 'cw']
c = 0
sum = 0
for i in l:
    c += 1
    if i=='c':
        n = len([x for x in l[c:] if x == 'w'])
        if n>1: sum += (f(n) // f(n-2)) // f(2)
print(sum)