import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] arr = sc.next().replaceAll("ing", "!").toCharArray();
        long ans = 0;
        long sCount = 0;
        for (char c : arr) {
            if (c == 'S') {
                sCount++;
            } else if (c == '!') {
                ans += sCount;
            }
        }
        System.out.println(ans);
    }
}