#include <iostream>
using namespace std;

int main() {
	int n, p = 0, x;
	cin >> n;
	for (int t = 0; t<n; t++) {
		cin >> x;
		if (x == p)
			if (p - x != 1 || p - x != -1)
			{
				cout << "F";
				return 1;
			}
		p = x;
	}
	cout << "T";
	return 0;
}