#include <iostream>
#include <vector>

/*
 * [No.346 チワワ数え上げ問題 - yukicoder](http://yukicoder.me/problems/987 "No.346 チワワ数え上げ問題 - yukicoder")
 * 提出者 : まろ<marony@binbo-kodakusan.com>
 * 使用言語 C++
 */
using namespace std;

auto main() -> int {
    string s;
    cin >> s;

    auto count = 0L, answer = 0L;
    for (auto it = s.rbegin(); it != s.rend(); ++it) {
        const auto &c = (*it);
        if (c == 'c' && count > 1) {
            answer += count * (count - 1L) / 2L;
        } else if (c == 'w')
            ++count;
    }

    cout << answer << endl;

    return 0;
}