#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (int)(n); i ++)
#define irep(i,n) for (int i = (int)(n) - 1;i >= 0;--i)
using namespace std;
using ll = long long;
using PL = pair<ll,ll>;
using P = pair<int,int>;
constexpr int INF = 1000000000;
constexpr long long HINF = 1000000000000000;
constexpr long long MOD = 1000000007;// = 998244353;
constexpr double EPS = 1e-4;
constexpr double PI = 3.14159265358979;

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

    string s; cin >> s;
    int N = s.size();
    vector<int> A(N + 1,0);
    irep(i,N - 2) {
        if (s.substr(i,3) == "ing") A[i] = A[i + 1] + 1;
        else A[i] = A[i + 1]; 
    }
    ll ans = 0;
    rep(i,N) {
        if (s[i] == 'S') ans += A[i + 1];
    }
    cout << ans << '\n';
    return 0;
}