#include <bits/stdc++.h>
using namespace std;

int main() {
	int a;
	cin >> a ;
	if (a < 151) {
		cout << "S";
	} else if (a <= 160) {
		cout << "M";
	} else if (a <= 170) {
		cout << "L";
	} else if (a <= 180) {
		cout << "XL";
	} else {
		cout << "XXL";
	}
	return 0;
}