package yukicoder.No627;

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		
		int T = in.nextInt();
		
		int now = 0;
		String ans = "T";
		for (int i = 0; i < T; i++) {
			int X = in.nextInt();
			if (now+1 == X || now-1 == X) {
				now = X;
			} else {
				ans = "F";
			}
		}
		System.out.println(ans);
	}
}