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

#define int long long





signed main() {
    
   
    int n;
    cin >> n;
    vector<int> v(n);
    for(auto &i : v){
        cin >> i;
        
    }
    string s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    sort(v.begin(),v.end());
    for(auto &i : v){
        i %= 26;
    }

    for(auto i : v){
        cout << s[i];
    }
    
    






    
    return 0;
}