#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const ll mod = 1000000007;
const int INF = 1001001001;

int main(){
    string s; cin >> s;
    int sz = s.size();
    vector<int> idx_ing, idx_S;
    for(int i = 0; i < sz - 2; i++){
        if(s.substr(i, 3) == "ing"){
            idx_ing.push_back(i);
        }
    }
    for(int i = 0; i < sz; i++){
        if(s[i] == 'S') idx_S.push_back(i);
    }
    ll sum = 0;
    for(int i = 0; i < idx_S.size(); i++){
        int tmp = idx_S[i];
        sum += idx_ing.end() - lower_bound(idx_ing.begin(), idx_ing.end(), tmp);
    }
    cout << sum << endl;
}