using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        if (s.Length < 4) Console.WriteLine(0);
        else getAns(s);
    }
    static void getAns(string s)
    {
        var ans = 0L;
        var ping = searchING(s);
        var ps = seachS(s);
        foreach (var x in ping) ans += ps[x - 1];
        Console.WriteLine(ans);
    }
    static int[] seachS(string s)
    {
        var sL = s.Length;
        var res = new int[sL];
        res[0] = s[0] == 'S' ? 1 : 0;
        for (int i = 1; i < sL; i++) res[i] = s[i] == 'S' ? res[i - 1] + 1 : res[i - 1];
        return res;
    }
    static List<int> searchING(string s)
    {
        var res = new List<int>();
        var sL = s.Length;
        var p = 0;
        while (p < sL)
        {
            var p2 = s.IndexOf("ing", p);
            if (p2 != -1) res.Add(p2);
            else break;
            p = p2 + 3;
        }
        return res;
    }
}