from bisect import *

S = input()
cpos = []
wpos = []
for i, s in enumerate(S):
    if s == "c":
        cpos.append(i)
    if s == "w":
        wpos.append(i)
nw = len(wpos)
ans = 0
for c in cpos:
    x = nw - bisect_left(wpos, c)
    ans += x * (x - 1) // 2
print(ans)