#include <iostream>
#include <string>

using lint = long long;

void solve() {
    std::string s;
    std::cin >> s;

    lint ans = 0, scnt = 0;
    for (int i = 0; i < (int)s.length(); ++i) {
        if (s[i] == 'S') ++scnt;
        if (s.substr(i, 3) == "ing") ans += scnt;
    }

    std::cout << ans << "\n";
}

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

    solve();

    return 0;
}