#include <bits/stdc++.h>
using namespace std;
int main(){
  int T;
  cin >> T;
  for (int i = 0; i < T; i++){
    int N;
    cin >> N;
    int D = (N * 4 + 2) / 3;
    if (D % 7 != 0){
      cout << -1 << endl;
    } else {
      D /= 7;
      if (D % 3 == 1){
        cout << "ABDCC";
      }
      if (D % 3 == 2){
        cout << "BBCCCFACAC";
      }
      for (int j = 0; j < D / 3; j++){
        cout << "ACCACCCCCCCCABACAAFFE";
      }
      cout << endl;
    }
  }
}