#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using llu = long long unsigned;

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

    map<char, int> data;
    for (auto c : s) { data[c]++; }

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