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

int N, t;
string T;

int main(void){
  cin >> t;
  for (int i = 0; i < t; i++) {
    cin >> N;
    T = "ABACBC";
    for (int j = 0; j < N - 2; j++) T += "ABC";
    cout << T << endl;
  }
  return 0;
}