#include <cassert>
#include <iostream>
#include <map>
using namespace std;

int main() {
    int n;
    string s;
    cin >> n >> s;
    assert(1 < n && n <= 100000);
    assert(s.length() == (size_t)n);
    for (int i = 0; i < n; ++i) {
        assert('A' <= s[i] && s[i] <= 'Z');
    }

    map<char, int> count;
    for (char c : s) {
        count[c] += 1;
    }

    for (char c = 'A'; c <= 'Z'; ++c) {
        cout << count[c];
    }
    cout << endl;
    return 0;
}