//#include <monsterenergy>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const int MAX = 1e9;
const int MIN = -1*1e9;
const ll MAXLL = 1e18;
const ll MINLL = -1*1e18;

int main()
{
    int N; cin >> N;
    string S; cin >> S;
    vector<int> V(1000);
    for(int i = 0; i < N; i++)
    {
        V[S[i]]++;
    }
    for(int i = 'A'; i <= 'Z'; i++) cout << V[i];
    cout << endl;
    return 0;
}