package m.shin;
import java.util.Scanner;

public class RandomWalknokiseki {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int T = s.nextInt();
		Boolean ft = true;
		int[] X = new int[T];
		for(int i = 0;i < T;i++){
			X[i] = s.nextInt();
			if(i > 0){
				if(Math.abs(X[i] - X[i-1]) != 1){
					ft = false;
				}
			}
		}
		s.close();
		if(ft){
			System.out.println("T");
		}else{
			System.out.println("F");
		}
	}

}