#include <iostream>
#include <algorithm>
#include <vector>
#include<string>

using namespace std;
int main() {
	int t,point=0;
	int patx, paty;
	bool flag = false;
	cin >> t;
	vector<int>x(t);
	for (int i = 0; i < t; i++) cin >> x[i];

	for (int i = 0; i < t; i++) {
		patx = point + 1;
		paty = point - 1;
		if (patx == x[i]) {
			point = patx;
		}else if(paty==x[i]){
			point = paty;
		}else{
			flag = true;
			break;
		}
	}
	if (flag)cout << "F\n";
	else cout << "T\n";
}