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

int main() {
  int N;
  cin >> N;
  string S;
  cin >> S;
  vector<int> c(26);
  for (int i = 0; i < S.size(); i++) {
    c[S[i] - 'A']++;
  }
  for (int i = 0; i < 26; i++) {
    cout << c[i];
  }
  cout << endl;
  return 0;
}