import math

s = input()

c = 0
for i in range(len(s)):
    if s[i] == 'c':
        if 'w' in s:
            w = s[i:].count('w')
            if w > 1:
                c +=  math.factorial(w) // (math.factorial(w - 2) * math.factorial(2))
print(c)