#include "bits/stdc++.h"
using namespace std;

int main() {
	int N, T, bT = 0;
	bool check = true;
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> T;
		if (abs(T - bT) != 1) check = false;
		bT = T;
	}
	if (check) cout << "T" << endl;
	else cout << "F" << endl;
}