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

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	int N;
	string s;
	cin >> N >> s;
	vector<int> c(26);
	rep(i, N) {
		int n = s[i] - 'A';
		c[n]++;
	}
	string ans;
	rep(i, 26) {
		string w = to_string(c[i]);
		ans += w;
	}
	cout << ans << endl;
}