#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i > b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
typedef long long ll;

int main() {
    fastcin;
    int T, x = 0;
    cin >> T;
    rep(i, 0, T) {
        int xi;
        cin >> xi;
        if(xi==(x-1) || xi==(x+1)) x = xi;
        else {
            cout << "F" << endl;
            return 0;
        }
    }
    cout << "T" << endl;
    return 0;
}