#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll n, sum = 0;
    str s;
    cin >> n >> s;
    for (ll i = 0; i < 26; i++)
    {
        ll countt = count(s.begin(), s.end(), (char)(i + 'A'));
        if (countt > 0)
        {
            sum++;
            cout << countt;
        }
    }
    for (ll i = sum; i < 26; i++) cout << 0;
    return 0;
}