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

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}
string ans_5 = "ABDCC";
string ans_10 = "BBCCCFACAC";
string ans_21 = "ACCACCCCCCCCABACAAFFE";
void solve() {
	int n;
	cin >> n;
	if (n % 21 == 5) {
		cout << ans_5;
		for (int i = 0; i < n / 21; i++) {
			cout << ans_21;
		}
		cout << endl;
	} else if (n % 21 == 10) {
		cout << ans_10;
		for (int i = 0; i < n / 21; i++) {
			cout << ans_21;
		}
		cout << endl;
	} else if (n % 21 == 0) {
		for (int i = 0; i < n / 21; i++) {
			cout << ans_21;
		}
		cout << endl;
	} else {
		cout << -1 << endl;
	}
}
int main() {
	fast_io();

	int t;
	cin >> t;
	for (; t--;) {
		solve();
	}
}