from bisect import bisect_right
S = input().strip()
C = []
W = []
for i in range(len(S)):
    if S[i]=="c":
        C.append(i)
    if S[i]=="w":
        W.append(i)
n = len(W)
ans = 0
for i in C:
    ind = bisect_right(W,i)
    m = n-ind
    ans += (m*(m-1))//2
print(ans)