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)