#include <bits/stdc++.h>
using namespace std;
using namespace chrono;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

int main()
{
    int64_t n;
    cin >> n;
    vector<int64_t> ds(n);
    for (auto &&d : ds)
    {
        cin >> d;
    }

    for (auto &&d : ds)
    {
        cout << char('A' + (d % 26));
    }
    cout << endl;

    return 0;
}