import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		int prev = 0;
		for (int i = 0; i < t; i++) {
		    int x = sc.nextInt();
		    if (Math.abs(prev - x) != 1) {
		        System.out.println("F");
		        return;
		    }
		    prev = x;
		}
		System.out.println("T");
	}
}