#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

int main() {
    string s; cin >> s;
    vector<int> dp(3);
    for (char c: s) {
        if (c == 'c') dp[0]++;
        if (c == 'w') dp[2] += dp[1], dp[1] += dp[0];
    }
    cout << dp[2] << endl;
    return 0;
}