#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a;
	cin>>a;
	if(a<=150) cout<<"S";
	if(a>=151&&a<=160) cout<<"M";
	if(a>=161&&a<=170) cout<<"L";
	if(a>=171&&a<=180) cout<<"XL";
	if(a>=181) cout<<"XXL";
	return 0;
}