#include <iostream>
using namespace std;
int main(){
	string S;
	cin >> S;
	int N = S.size();
	int cnt = 0;
	long long ans = 0;
	for (int i = 0; i <= N - 3; i++){
		if (S[i] == 'S'){
			cnt++;
		}
		if (S.substr(i, 3) == "ing"){
			ans += cnt;
		}
	}
	cout << ans << endl;
}