#include <iostream>
using namespace std;

int main()
{
	int t, x;
	int y = 0;
	bool checkert = true;
	bool checkerf = false;
	
	cin >> t;
		for (int i = 0; i < t; i++) {
			cin >> x;
			if (x == y + 1 || x == y - 1) {
				checkert = true;
			}
			else {
				checkerf = true;
			}
			y = x;
	}
		if (checkerf == true) {
			cout << "F" << endl;
		}
		else if(checkert == true) {
			cout << "T" << endl;
		}
    return 0;
}