#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
    string S; cin >> S;
    int N = S.size();
    LL A, B, C; A = B = C = 0;
    rep(i, N) {
        if (S[i] == 'c') A++;
        if (S[i] == 'w') { C += B; B += A; }
    }
    cout << C << endl;
    return 0;
}