#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#ifdef LOCAL
#include <algo/debug.h>
#else
#define debug(...) void(0)
#endif
#include<atcoder/all>
using namespace atcoder;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N; cin >> N;
    string S; cin >> S;
    map<char, int> MP; for(auto s: S) MP[s]++;
    for(char a = 'A'; a <= 'Z'; a++) {
        cout << MP[a];
    }cout << endl;
}