#include <bits/stdc++.h>
#ifdef LOCAL
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

int main() {
    int T;
    cin >> T;
    while (T--) {
        int N;
        cin >> N;
        string S = "ABACBC";
        for (int i = 0; i < N / 2; i++) cout << S;
        if (N % 2 == 1) cout << "ABC";
        cout << endl;
    }
}