#include <bits/stdc++.h>
using namespace std;
typedef long long LL;

int main() {
    string S;cin>>S;
    int N=S.size();
    vector<LL> w(N);
    for(int i = 0; i < N; i++)if(S[i]=='w')w[i]++;
    for(int i = N-1; i >0; i--)w[i-1]+=w[i];
    LL res=0;
    for(int i = 0; i < N; i++)if(S[i]=='c')res+=w[i]*(w[i]-1)/2;
    cout<<res<<endl;
    return 0;
}