#include <iostream>
using namespace std;

int main() {
	int T;
	cin >> T;
	while (T--) {
		int n;
		cin >> n;
		for (int i = 0; i < n / 2; i++) cout << "ABC";
		cout << "ABACBC";
		for (int i = 0; i < (n + 1) / 2; i++) cout << "ABC";
		cout << endl;
	}
	return 0;
}