use std::io::Read;

fn main() {
    let mut all_data = String::new();
    std::io::stdin().read_to_string(&mut all_data).ok();
    let mut all_data = all_data.trim().split('\n').map(|s| s.trim());
    let t: usize = all_data.next().unwrap().parse().unwrap();
    let mut pos: isize = 0;
    for i in all_data.take(t).map(|x| x.parse::<isize>().unwrap()) {
        if (i-pos).abs() != 1 {
            println!("F");
            return;
        }
        pos = i;
    }
    println!("T");
}