#include <iostream>
#include <vector>

using namespace std;
//変数デバッグ
#define DEB(variable) cout << #variable << "=" << variable << endl

//for簡易表記(引数ミス防止)
#define INFOR(inc, a, b) for (int inc = (a); (inc) < (b); (inc)++) //incをaにし、b-a回(iがb未満の間)処理を行う
#define DEFOR(inc, a, b) for ((inc) = (a); (inc) > (b); (inc)--)   //incをaにし、a-b回(iがbより大きい間)処理を行う

int main(){
    int n;
    bool flag = 0;
    cin >> n;
    vector<int> v(n);

    INFOR(i,0,n){
        cin >> v[i];
    }

if(!(1==v[0])&&!(-1==v[0])){
        flag = 1;
}

    INFOR(i,0,n-1){
        if(flag){
            break;
        }
        if((!(1==v[i+1]-v[i]))&&(!(-1==v[i+1]-v[i]))){
            flag = 1;
        }
    }

    if(flag){
        cout << "F";
    }
    else{
        cout << "T";
    }

    cout << endl;

    return 0;
}