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

int T, N[109];

int main() {
	cin >> T;
	for (int i = 1; i <= T; i++) cin >> N[i];
	for (int i = 1; i <= T; i++) {
		string ans = "ABACBC";
		for (int j = 1; j <= N[i] - 2; j++) ans += "ABC";
		cout << ans << endl;
	}
	return 0;
}