#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<functional>
#include<fstream>
#define rep(N) for (int i = 0; i < N; i++)
#define For(i, N) for (i = 0; i < N; i++)
#define re return 0

using namespace std;
using ll = long long int;
using vi = vector<int>;


int main() {
	int a, b;
	int T;
	cin >> T;
	a = 0;
	while (cin >> b) {
		int t = a;
		a = b;
		b = t;
		if (a + 1 == b)continue;
		else if (b + 1 == a)continue;
		cout << "F" << endl;
		re;
	}
	cout << "T" << endl;
}