S=input()
N=len(S)
C=[0]+[s=="c" for s in S]
W=[0]+[s=="w" for s in S]
for i in range(1,N+1):
    C[i]+=C[i-1]
    W[i]+=W[i-1]
ans=0
for i in range(N):
    if S[i]=="w":
        ans+=C[i]*(W[N]-W[i+1])
print(ans)