/*==========================================================================*/
/*
    auther:    Dev1ce
    created:   09.04.2024 18:38:35
*/
/*--------------------------------------------------------------------------*/

#include<bits/stdc++.h>

using namespace std;


int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	string s;
	cin >> n >> s;
	int cnt[28] = {};
	for (int i = 0; i < n; i++) {
		++cnt[s[i] - 'A'];
	}
	for (char i = 'A'; i <= 'Z'; i++) {
		cout << cnt[i - 'A'];
	}
	cout << '\n';
	return 0;	
}