#include <iostream>
#include <string>
using namespace std;

int main() {
    int t;
    cin >> t;
    
    for (int i = 0; i < t; ++i) {
        int n;
        cin >> n;
        string s = "ABACBC" + string("ABC").substr(0, n - 2);
        cout << s << endl;
    }

    return 0;
}