#include<iostream>
#include<vector>

bool judge(int& a_n, int& a_n1, int& distance) {
	int plus_an = a_n1 + distance;
	int minus_an = a_n1 - distance;

	if (a_n == plus_an || a_n == minus_an) {
		return true;
	}
	return false;
}

int main() {
	std::int32_t T;
	std::vector<int32_t> x;
	std::vector<bool> ans;
	int zero = 0;
	std::cin >> T;

	for (int i = 0; i < T; i++) {
		int x_tmp;
		std::cin >> x_tmp;
		x.push_back(x_tmp);
	}

	int distance = 1;
	for (int i = 0; i < T - 1; i++) {
		if (i != 0) {
			bool ans_tmp = judge(x[i], x[i - 1], distance);
			ans.push_back(ans_tmp);
		}
		else {
			bool ans_tmp = judge(x[0], zero, distance);
			ans.push_back(ans_tmp);
		}
	}
	int result = true;
	for (auto i : ans) {
		if (i == false)
			result = false;
	}
	if (result == true) {
		std::cout << "T" << std::endl;
	}
	else {
		std::cout << "F" << std::endl;
	}

	return 0;
}