import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine());
		for (int i = 0; i < t; i++) {
			int n = Integer.parseInt(br.readLine());
			StringBuilder sb = new StringBuilder("ABACBC");
			for (int j = 0; j < n - 2; j++) {
				sb.append("ABC");
			}
			System.out.println(sb.toString());
		}
		br.close();
	}
}