#include "bits/stdc++.h"
using namespace std;
#define int long long
#define rep(i, n) for (int i = 0; i < n; i++)
signed main() {
  int n;
  string s;
  cin >> n >> s;
  map<char, int> mp;
  rep(i, s.size()) { mp[s[i]]++; }
  for (int i = 0; i < 26; i++) {
    cout << mp[char('A' + i)];
  }
}