#include <bits/stdc++.h>
using namespace std;
using lint = long long;
int main() {
  int n;
  string s;
  cin >> n >> s;
  vector<int> vec(26);
  for (int i = 0; i < n; i++) {
    vec[s[i]-'A']++;
  }
  for (int i = 0; i < 26; i++) cout << vec[i];
  cout << endl;
}