#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int DY[]{1, 0, -1, 0}, DX[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1}, DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  const string five = "CCBBA", ten = "AACACFCFAC", twenty_one = "ECAECCFACDCACECCCAAAC";
  int t; cin >> t;
  while (t--) {
    int n; cin >> n;
    int l = (n / 3) * 4;
    if (n % 3 == 1) l += 2;
    if (n % 3 == 2) l += 3;
    if (l % 7 > 0) {
      cout << "-1\n";
      continue;
    }
    string ans = "";
    for (; n >= 21; n -= 21) ans += twenty_one;
    if (n == 5) ans = five + ans;
    if (n == 10) ans = ten + ans;
    cout << ans << '\n';
  }
  return 0;
}