#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  string s;
  cin >> s;
  ll ans = 0;
  int cnt = 0;
  rep(i, s.size()) {
    if (s[i] == 'S') ++cnt;
    if (s.substr(i, 3) == "ing") ans += cnt;
  }
  cout << ans << '\n';
  return 0;
}