#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>

#ifndef ONLINE_JUDGE
#include "debug.h"  // https://github.com/Heltion/debug.h/blob/main/debug.h
#else
#define debug(...) (void)417
#endif

using i64 = int64_t;
int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  cout << fixed << setprecision(20);
  int t;
  cin >> t;
  for (int ti = 0; ti < t; ti += 1) {
    int n;
    cin >> n;
    cout << "ABAC";
    for (int i = 0; i < n - 2; i += 1) { cout << "ABC"; }
    cout << "BC\n";
  }
}