// clang-format off
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define stoi stoll
using pii = pair<int,int>;
using vi = vector<int>;
using vvi = vector<vi>;
#define all(c) begin(c), end(c)
#define rall(c) rbegin(c), rend(c)
#define fore(x, c) for(auto &&x : c)
#define rep(i, a, n) for(int i = a, i##len = (int)(n); i < i##len; ++i)
#define rrep(i, a, n) for(int i = (int)(n - 1); i >= a; --i)
#define sz(c) ((int)c.size())
#define contains(c, x) (c.find(x) != end(c))
#define inseg(l, x, r) ((l) <= (x) && (x) < (r))
#define dump(...)
#define pb push_back
#define eb emplace_back
#define _ 0
const signed INF_ = 1001001001; const long long INF = 1001001001001001001LL;
const int DX[9] = {0,1,0,-1,1,1,-1,-1,0}, DY[9] = {-1,0,1,0,-1,1,1,-1,0};
template<class T> ostream& operator<<(ostream &os, const vector<T> &v) {
  for (auto i = begin(v); i != end(v); i++) os<<*i<<(i==end(v)-1?"":" ");return os;}
template<class T> istream& operator>>(istream &is, vector<T> &v) {
  for (auto i = begin(v); i != end(v); i++) is>>*i;return is;}
template<class T,class U> istream& operator>>(istream &is, pair<T,U> &p) {
  is>>p.first>>p.second;return is;}
template<class T, class U> bool chmax(T &a, const U &b){return a<b?a=b,1:0;}
template<class T, class U> bool chmin(T &a, const U &b){return a>b?a=b,1:0;}
template <class T> void psum(T& c) {partial_sum(begin(c), end(c), begin(c));}
template<class T> using heap = priority_queue<T, deque<T>, greater<T>>;
struct before_main_function {
  before_main_function() {
      cin.tie(nullptr); ios::sync_with_stdio(0);
      cout << setprecision(15) << fixed;
  }
} before_main_function;
// clang-format on
//------------------8<------------------------------------8<--------------------

signed main() {
  int N;
  cin >> N;
  vector<string> S(N, string(N, '.'));

  // clang-format off
  vector<string> pat4 = {
      "abcc",
      "abdd",
      "eegh",
      "ffgh",
  };
  vector<string> pat5 = {
      "aabbc",
      "hii.c",
      "h..jd",
      "g..jd",
      "gffee",
  };
  vector<string> pat6 = {
      "aa.ccd",
      "..bf.d",
      "..bfee",
      "gghkk.",
      "j.h..l",
      "jii..l",
  };
  vector<string> pat7 = {
      "aa..c.d",
      "..bbc.d",
      "llmm.e.",
      ".k..ne.",
      ".k..nff",
      "j.ihh..",
      "j.i..gg",
  };
  // clang-format on

  if (N == 2) {
    cout << -1 << endl;
    return 0;
  }
  if (N == 3) {
    cout << "aab" << endl;
    cout << "c.b" << endl;
    cout << "cdd" << endl;
    return 0;
  }

  int t = N / 4 - 1;
  rep(i, 0, t) {
    rep(k, 0, 4) {
      rep(l, 0, 4) { S[i * 4 + k][i * 4 + l] = pat4[k][l]; }
    }
  }
  switch (N % 4) {
    case 0:
      rep(k, 0, 4) {
        rep(l, 0, 4) { S[t * 4 + k][t * 4 + l] = pat4[k][l]; }
      }
      break;
    case 1:
      rep(k, 0, 5) {
        rep(l, 0, 5) { S[t * 4 + k][t * 4 + l] = pat5[k][l]; }
      }
      break;
    case 2:
      rep(k, 0, 6) {
        rep(l, 0, 6) { S[t * 4 + k][t * 4 + l] = pat6[k][l]; }
      }
      break;
    case 3:
      rep(k, 0, 7) {
        rep(l, 0, 7) { S[t * 4 + k][t * 4 + l] = pat7[k][l]; }
      }
      break;
  }

  rep(i, 0, N) { cout << S[i] << endl; }
  return (0 ^ _ ^ 0);
}



Measured memory_bytes: 2304