#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < n; i++)
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)

int main(){
   ll n ;
   cin >> n ;
   string s ;
   cin >> s ;
   map<char,ll> mp ;
   rep(i,n){
      mp[s[i]]++ ;
   }
   rep(i,26){
      cout << mp['A'+i] ;
   }
   cout << endl ;
}