#include <bits/stdc++.h>
#include <random>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
#define int ll
//#define int __int128
//#define ll __int128
typedef pair<int, int   > pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vpi;
typedef vector< vi > vvi;
typedef vector< vvi > vvvi;
typedef vector<short> vs;
typedef vector<vs> vvs;
typedef vector<vvs> vvvs;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<ld> vld;
typedef vector<vld> vvld;
typedef vector<vvld> vvvld;
typedef vector<string> vst;
typedef vector<vst> vvst;
typedef pair<ld, ld> pld;
//typedef complex<double> base;

#define inmin(a, b) a = min(a, (b))
#define inmax(a, b) a = max(a, (b))
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define sqr(x) ((x) * (x))
#define fori(i, n) for(int i = 0; i < (int)(n); ++i)
#define SZ(a) ((int)((a).size()))
#define triple(T) tuple<T, T, T>
#define quad(T) tuple<T, T, T, T>
#define watch(x) cerr << (#x) << " = " << (x) << endl;

#ifdef RUS_HOME
#define cerr cout
#else
#define cerr if (false) cerr
#endif

const double PI = 2 * acos(0.0);
#define rand shittttty_shit
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng_64(chrono::steady_clock::now().time_since_epoch().count());

const string DIGITS = "0123456789";
const string ALPH = "abcdefghijklmnopqrstuvwxyz";

template <class T0, class T1>
inline ostream & operator << (ostream &out, pair<T0, T1> &a) {
    return out << "{" << a.first << ", " << a.second << "}";
}

template <class T0, class T1, class T2>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << "}";
}

template <class T0, class T1, class T2, class T3>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2, T3> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << ", " <<  get<3>(a) << "}";
}

template<class T>
inline ostream & operator << (ostream &out, vector<T> &a) {
    out << "[";
    fori (i, a.size())
        out << a[i] << vector<string>{", ", "]  "}[i + 1 == a.size()];
    return out;
}



void smain();

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

#ifdef RUS_HOME
    freopen("input", "r", stdin);
    clock_t start = clock();
#endif
    cout << setprecision(12) << fixed;
    smain();
#ifdef RUS_HOME
    cout << "\n\n\n\nTOTAL EXECUTION TIME: " << float( clock () - start ) /  CLOCKS_PER_SEC << endl;
#endif
    return 0;
}
vector<string> a;
void ch(int i) {
    a[i][i] = 'a';
    a[i][i + 1] = 'a';
    a[i + 1][i] = 'b';
    a[i + 1][i + 1] = 'b';
    a[i][i + 2] = 'c';
    a[i + 1][i + 2] = 'c';
    a[i][i + 3] = 'd';
    a[i + 1][i + 3] = 'd';
    a[i + 2][i + 2] = 'a';
    a[i + 2][i + 3] = 'a';
    a[i + 3][i + 2] = 'b';
    a[i + 3][i + 3] = 'b';
    a[i + 2][i] = 'c';
    a[i + 3][i] = 'c';
    a[i + 2][i + 1] = 'd';
    a[i + 3][i + 1] = 'd';
}

void tr_one(int i, int j) {
    a[i][j] = 'z';
    a[i][j + 1] = 'z';
    a[i + 1][j + 2] = 'y';
    a[i + 2][j + 2] = 'y';
}

void tr_two(int i) {
    a[i][i] = 'a';
    a[i][i + 1] = 'a';
    a[i][i + 2] = 'b';
    a[i + 1][i + 2] = 'b';
    a[i + 2][i + 2] = 'c';
    a[i + 2][i + 1] = 'c';
    a[i + 2][i] = 'd';
    a[i + 1][i] = 'd';
}

void pyat(int i) {
    a[i][i] = 'a';
    a[i][i + 1] = 'a';
    a[i][i + 2] = 'b';
    a[i][i + 3] = 'b';
    a[i][i + 4] = 'a';
    a[i + 1][i + 4] = 'a';
    a[i + 2][i + 4] = 'b';
    a[i + 3][i + 4] = 'b';
    a[i + 4][i + 4] = 'a';
    a[i + 4][i + 3] = 'a';
    a[i + 4][i + 2] = 'b';
    a[i + 4][i + 1] = 'b';
    a[i + 4][i] = 'a';
    a[i + 3][i] = 'a';
    a[i + 2][i] = 'b';
    a[i + 1][i] = 'b';
    tr_one(i + 1, i + 1);
}

void sem(int i) {
    a[i + 6][i + 0] = 'z';
    a[i + 6][i + 1] = 'z';
    a[i + 6][i + 2] = 'y';
    a[i + 6][i + 3] = 'y';
    a[i + 6][i + 4] = 'w';
    a[i + 6][i + 5] = 'w';
    a[i + 0][i + 6] = 'z';
    a[i + 1][i + 6] = 'z';
    a[i + 2][i + 6] = 'y';
    a[i + 3][i + 6] = 'y';
    a[i + 4][i + 6] = 'w';
    a[i + 5][i + 6] = 'w';
    tr_two(i);
    tr_two(i + 3);
}

int n;
void print() {
    for (int i = 0; i < n; i++) {
        cout << a[i] << "\n";
    }
}

void smain() {


    cin >> n;
    a.resize(n);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            a[i] += '.';
        }
    }
    if (n < 3) {
        cout << -1;
    } else if (n % 3 == 0) {
        for (int i = 0; i < n; i += 3) {
            tr_one(i, i);
        }
        print();
    } else if (n % 4 == 0) {
        for (int i = 0; i < n; i += 4) {
            ch(i);
        }
        print();
    } else if (n % 4 == 2) {
        for (int i = 0; i < n - 6; i += 4) {
            ch(i);
        }
        int y = n - 6;
        tr_two(y);
        tr_two(y + 3);
        tr_one(y, y + 3);
        tr_one(y + 3, y);
        print();
    } else if (n % 4 == 1) {
        for (int i = 0; i < n - 5; i += 4) {
            ch(i);
        }
        pyat(n - 5);
        print();
    } else if (n % 4 == 3) {
        for (int i = 0; i < n - 7; i += 4) {
            ch(i);
        }
        sem(n - 7);
        print();
    } else {
        cout << -1;
    }


}

Measured memory_bytes: 2304