#include<bits/stdc++.h>
using namespace std;
using ll = long long;
void solve();
int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int test_case;
  cin>>test_case;
  while (test_case--){
    solve();
  }
}
void solve(){
  int N;
  cin>>N;
  string S="ABACBC";
  for(int i=2;i<N;i++){
    S+="ABC";
  }
  cout<<S<<'\n';
}