#include <iostream>
using namespace std;
int main() {
int v, f, m, t;
cin >> v >> f >> m >> t;
while (v>0){
if (v - f < 0) {
cout << "F" << endl;
return 0;
}
v -= f;
if (v - m < 0) {
cout << "M" << endl;
return 0;
}
v -= m;
if (v - t < 0) {
cout << "T" << endl;
return 0;
}
v -= t;
cout << "F" << endl;
return 0;
}
}
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