#include <bits/stdc++.h>
using namespace std;
 
int main() {
	ios_base::sync_with_stdio(false); 
    cin.tie(NULL);
	cout.tie(NULL);
 
	int t, n;
    cin >> t;
    for (int i = 1; i <= t; i++) {
        cin >> n;
        cout << "ABAC";
        for (int j = 1; j <= n - 2; j++)
            cout << "ABC";
        cout << "BC";
        if (i != t)
            cout << '\n';
    }
	return 0;
}