import java.util.*;
import java.util.stream.Stream;
import java.time.*;
import java.time.format.*;

public class No627 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		int[] x = new int[t];
		for(int i = 0 ; i < t; i++) {
			x[i] = sc.nextInt();
		}
		if(x[0] == 0) {
			System.out.println("F");
			return;
		}
		for(int i = 0; i < t - 1; i++) {
			if(Math.abs(x[i] - x[i + 1]) != 1) {
				System.out.println("F");
				return;
			}
		}
		System.out.println("T");
	}
}