#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
#include<bitset>
#include<cassert>
#include<complex>
#include<fstream>
#include<cstdlib>
#include<functional>
#include<array>
using namespace std;
typedef long long ll;
const int mod=998244353;
const int dx[]={1,0,0,-1},dy[]={0,1,-1,0};
int main(){
	string s;
	cin>>s;
	int cnt=0;
	ll ans=0;
	for(int i=0;i<s.size();i++){
		if(s[i]=='S')
			cnt++;
		if(s.substr(i,3)=="ing")
			ans+=cnt;
	}
	cout<<ans<<endl;
}