#include <iostream>
#include <string>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <tuple>
#include <cstdio>
#include <cmath>
#include <cassert>
#define rep(i, n) for(i = 0; i < n; i++)
#define int long long
using namespace std;

signed main() {
	int n;
	string s;
	cin >> n >> s;

	int i;
	int cnt[26] = {0};
	rep(i, n) cnt[s[i] - 'A']++;
	
	rep(i, 26) {
		string nafmo = to_string(cnt[i]);
		cout << nafmo;
	}
	cout << endl;
	return 0;
}