#include <bits/stdc++.h>
using namespace std;
int main() {
int V, A, B, C;
cin >> V >> A >> B >> C;
if (V - A < 0) {
cout << "F" << endl;
return 0;
}
V -= A;
if (V - B < 0) {
cout << "M" << endl;
return 0;
}
V -= B;
if (V - C < 0) {
cout << "T" << endl;
return 0;
}
V -= C;
cout << "F" << endl;
return 0;
}
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