import java.util.ArrayList;
import java.util.Scanner;

public class Rumdum {

    public static void main(String[] args) {
	ArrayList<Integer> list = new ArrayList<>();
	Scanner scanner = new Scanner(System.in);

	int T = scanner.nextInt();
	int buff = 0;

	for(int i=0;i<T;i++){
	    int t = scanner.nextInt();
	    if(buff+1 == t || buff-1 == t){
		buff = t;
	    }else{
		System.out.println("F");
		return;
	    }
	}
	System.out.println("T");
	return;

    }

}