#include "bits/stdc++.h"
using namespace std;
using Graph = vector<vector<int>>;
typedef long long ll;
typedef pair<ll, ll> P;
#define rep(i,n) for (ll i = 0; i < (n); ++i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const long long mod = 1e9 + 7;

ll gcd(ll a, ll b) {
	return b ? gcd(b, a % b) : a;
}

ll lcm(ll a, ll b) {
	return a / gcd(a, b) * b;
}

int main() {
	ll t;
	cin >> t;

	ll now=0;
	vector<ll> v(t);

	rep(i, t) {
		cin >> v[i];
		ll a = abs(now - v[i]);
	}

	rep(i, t) {
		ll a = abs(now - v[i]);
		if (a != 1) {
			cout << "F" << endl;
			return 0;
		} else {
			now = v[i];
		}
	}

	cout << "T" << endl;
}