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

int N;
int D[109];

int main() {
	cin >> N;
	for (int i = 1; i <= N; i++) {
		cin >> D[i];
		int rest = D[i] / 26;
		cout << (char)('A' + rest);
	}
	cout << endl;
}