#include <fstream>
#include <iostream>

int main() {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());
	
	int T, X;
	int point = 0;
	bool flg = true;

	std::cin >> T;
	for (int i = 0; i < T; i++) {
		std::cin >> X;
		if (std::abs(point - X) == 1) {
			point = X;
		}
		else {
			flg = false;
			break;
		}
	}

	if (flg) {
		std::cout << "T" << std::endl;
	}
	else {
		std::cout << "F" << std::endl;
	}

	return 0;
}