// iostream is too mainstream
#include <cstdio>
// bitch please
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <cmath>
#include <iomanip>
#define dibs reserve
#define OVER9000 1234567890
#define ALL_THE(CAKE,LIE) for(auto LIE =CAKE.begin(); LIE != CAKE.end(); LIE++)
#define tisic 47
#define soclose 1e-8
#define chocolate win
// so much chocolate
#define patkan 9
#define ff first
#define ss second
#define abs(x) ((x < 0)?-(x):x)
#define uint unsigned int
#define dbl long double
using namespace std;
// mylittledoge

int main() {
	cin.sync_with_stdio(0);
	cin.tie(0);
	int N;
	string s;
	cin >> N >> s;
	int d =0;
	for(int i =0; i < N-1; i++) {
		if(s[i] == 'H') d++;
		else d--;}
	if(d > 0) {cout << "H\n"; return 0;}
	if(d < 0) {cout << "M\n"; return 0;}

	if(N == 1) {cout << "HM\n"; return 0;}

	if(s[N-2] == 'H') cout << "M\n";
	else cout << "H\n"; 
	return 0;}

// look at my code
// my code is amazing