import java.io.*;
import java.util.*;


public class Main_yukicoder627 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int t = sc.nextInt();

		int[] x = new int[t];
		for (int i = 0; i < t; i++) {
			x[i] = sc.nextInt();
		}

		boolean flag = true;
		for (int i = 0; i < t; i++) {
			if (i > 0) {
				if (Math.abs(x[i] - x[i - 1]) != 1) {
					flag = false;
					break;
				}
			}

			int tmp = i + 1 - Math.abs(x[i]);
			if (tmp < 0) {
				flag = false;
//				pr.printf("%d %d %d\n", i, x[i], tmp);
				break;
			} else {
				if (tmp % 2 != 0) {
					flag = false;
//					pr.printf("  %d %d %d\n", i, x[i], tmp);
					break;
				}
			}
		}

		if (flag) {
			pr.println("T");
		} else {
			pr.println("F");
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}