#include <bits/stdc++.h>
// #include <boost/multiprecision/cpp_int.hpp>
using namespace std;
// using bigint = boost::multiprecision::cpp_int;

template <typename T> using min_priority_queue = priority_queue<T,vector<T>,greater<T>>;

random_device seed_gen;
mt19937 engine(seed_gen());

int64_t get_time_ns(){
    struct::timespec t;
    clock_gettime(CLOCK_MONOTONIC, &t);
    return t.tv_sec * int64_t(1'000'000'000) + t.tv_nsec;
}

int main() {
    int t; cin >> t;
    vector<int> X(t+1, 0);
    for(int i = 0; i < t; i++) cin >> X[i+1];

    for(int i = 0; i < t; i++) {
        if(abs(X[i] - X[i+1]) == 1) continue;
        cout << "F" << endl;
        return 0;
    }
    cout << "T" << endl;
    return 0;
}