fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s: Vec<char> = s.trim().chars().collect();

    let mut starts: Vec<usize> = vec![];
    let mut ends: Vec<usize> = vec![];
    for i in 0..s.len()-2 {
        if s[i] == 'S' { starts.push(i); }
        if s[i] == 'i' && s[i+1] == 'n' && s[i+2] == 'g' {
            ends.push(i);
        }
    }
    let mut result: usize = 0;
    let mut eidx: usize = 0;
    let elen = ends.len();
    for sidx in starts.iter() {
        let temp = eidx;
        for j in temp..elen {
            if sidx < &ends[j] {
                result += elen - j;
                break;
            } else {
                eidx += 1;
            }
        }
    }
    println!("{}", result);
}