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

#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
  int T;
  cin >> T;
  rep(i, T) {
    int N;
    cin >> N;
    string S = "ABACBC";
    rep(j, N-2)
      S += "ABC";
    cout << S << endl;
  }
  return 0;
}