#include <algorithm>
#include <iostream>
#include <set>
#include <vector>

using namespace std;

int main(void) {
    string s;
    cin >> s;

    vector<int> idxs;
    for (int i = 0; i < (int)s.size()-2; ++i) {
        if (s.substr(i, 3) == "ing") idxs.push_back(i);
    }

    long long ans = 0;
    for (int i = 0; i < s.size(); ++i) {
        if (s[i] == 'S') {
            auto it = lower_bound(idxs.begin(), idxs.end(), i);
            if (it == idxs.end()) continue;

            int idx = it - idxs.begin();
            ans += (idxs.size() - idx);
        }
    }

    cout << ans << endl;
}