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