#include <iostream>
using namespace std;
int main() {
int V, A, B, C;
cin >> V >> A >> B >> C;
if (V < A) {
cout << 'F';
}
else if (V < A + B) {
cout << 'M';
}
else if (V < A + B + C) {
cout << 'T';
}
return 0;
}
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