package algo;

import java.util.*;

public class sample7 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		List<Integer> list = new ArrayList<Integer>();
		list.add(0);
		for(int i = 1; i <= T; i++) {
			list.add(sc.nextInt());
			if(Math.abs(list.get(i-1) - list.get(i)) == 1) {
				
			}
			else {
				System.out.println("F");
				return;
			}
		}
		System.out.println("T");
	}
}