#include <bits/stdc++.h>
#ifdef LOCAL
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

int main() {
    int N;
    cin >> N;
    string S;
    cin >> S;

    vector<int> cnt(26, 0);
    for (int i = 0; i < N; i++) {
        cnt[S[i] - 'A']++;
    }
    string ans = "";
    for (int i = 0; i < 26; i++) {
        ans += to_string(cnt[i]);
    }

    cout << ans << endl;
}