#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    string s;
    cin >> s;

    vector<int> vs,vi;

    size_t i{ 0 }, p;
    while ((p = s.find("S", i)) != string::npos)
    {
        vs.push_back(p);
        i = p + 1;
    }

    i = 1;
    while ((p = s.find("ing", i)) != string::npos)
    {
        vi.push_back(p);
        i = p + 3;
    }

    ll res{ 0 };

    for (size_t i = 0; i < vs.size(); ++i)
    {
        auto it = upper_bound(vi.begin(), vi.end(), vs[i]);
        if (it != vi.end())
            res += vi.end() - it;
    }
    cout << res << "\n";

    return 0;
}