/*
 /+==================================================+\
//+--------------------------------------------------+\\
|.|\\...>>>>>>> Hollwo_Pelw(ass) 's code <<<<<<<...//|.|
\\+--------------------------------------------------+//
 \+==================================================+/
*/
#include <bits/stdc++.h>
using namespace std;
// type
typedef long long ll;
typedef long double ld;
// pair
#define F                   first
#define S                   second
#define pii                 pair<int, int>
#define pll                 pair<ll, ll>
#define pdd                 pair<ld, ld>
// vector & !!?(string)
#define eb                  emplace_back
#define pb                  push_back
#define all(a)              a.begin(), a.end()
#define rall(a)             a.rbegin(), a.rend()
#define sz(a)               a.size()
#define len(a)              a.length()
// I/O
#define open(file, in, out) if (fopen(file in, "r")) {        \
                                freopen(file in, "r", stdin);  \
                                freopen(file out, "w", stdout); \
                            }
#define FAST_IO             std::ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define setpre(n)           fixed << setprecision(n)
bool endline = false;
template<class T>
istream& operator >> (istream& inp, vector<T>& v){
    for (auto& it : v) inp >> it;
    return inp;
}
template<class T>
ostream& operator << (ostream& out, vector<T>& v){
    for (auto& it : v) out << it << (endline ? "\n" : " ");
    return out;
}
template<class T, class U>
istream& operator >> (istream& inp, pair<T, U>& v){
    inp >> v.F >> v.S;
    return inp;
}
template<class T, class U>
ostream& operator << (ostream& out, pair<T, U>& v){
    out << v.F << ' ' << v.S;
    return out;
}

// geometry calculate
#define pi                  acos(-1.0)
#define g_sin(a)            sin(a*pi/180)
#define g_cos(a)            cos(a*pi/180)
#define g_tan(a)            tan(a*pi/180)
// set val
#define ms0(a)              memset(a,        0, sizeof(a));
#define ms1(a)              memset(a,        1, sizeof(a));
#define msn1(a)             memset(a,       -1, sizeof(a));
#define msinf(a)            memset(a, 0x3f3f3f, sizeof(a));
// constant
const int mod1 = 998244353, mod = 1e9 + 7;
const int MAXN = 2e5 + 6 , MAXM = 5e5 + 5;
const int inf = 2e9; const ll linf = 1e18;
// code
#define int long long

char s4[][10] = {
    "aacd",
    "bbcd",
    "cdaa",
    "cdbb"
};

char s5[][10] = {
    "..abc",
    "..abc",
    "aaeef",
    "bbh.f",
    "cchgg"
};

char s6[][10] = {
    "aabb.c",
    ".e.ffc",
    "de...d",
    "d...ed",
    "cff.e.",
    "c.bbaa"
};

char s7[][10] = {
    "aabbcc.",
    ".dd.ddc",
    "d..d..c",
    "d..d..b",
    ".dd.ddb",
    "d..d..a",
    "d..d..a"
};

char ans[1001][1001];

void Solve() {
    int n; cin >> n;
    if (n < 3) {
        cout << -1;
        return ;
    }
    if (n == 3){
        cout << "aa.\n..a\n..a";
        return;
    }
    int x = n / 4 - 1;
    int y = n - 4 * x;
    for (int i = 0; i < n; i++){
        for (int j = 0; j < n; j++){
            ans[i][j] = '.';
        }
    }
    if (y == 4){
        for (int i = 0; i < y; i++){
            for (int j = 0; j < y; j++){
                ans[i][j] = s4[i][j];
            }
        }
    }
    if (y == 5){
        for (int i = 0; i < y; i++){
            for (int j = 0; j < y; j++){
                ans[i][j] = s5[i][j];
            }
        }
    }
    if (y == 6){
        for (int i = 0; i < y; i++){
            for (int j = 0; j < y; j++){
                ans[i][j] = s6[i][j];
            }
        }
    }
    if (y == 7){
        for (int i = 0; i < y; i++){
            for (int j = 0; j < y; j++){
                ans[i][j] = s7[i][j];
            }
        }
    }
    for (int t = 0; t < x; t++){
        for (int i = 0; i < 4; i++){
            for (int j = 0; j < 4; j++){
                ans[t * 4 + y + i][t * 4 + y + j] = s4[i][j];
            }
        }
    }
    for (int i = 0; i < n; i++){
        for (int j = 0; j < n; j++){
            cout << ans[i][j];
        }
        cout << endl;
    }
}

signed main(){
    open("", ".inp", ".out");
    FAST_IO; int TC = 1;
//    cin >> TC;
    while(TC--) Solve();
    return 0;
}
/*

\/-=====>>><<<-------- DEBUG -------->>><<<=====-\/
/\.............................................../\
+====================== INP ======================+


+====================== OUT ======================+


+======================*****======================+
\/...............................................\/
/\-=====>>><<<--------= END =-------->>><<<=====-/\

*/


Measured memory_bytes: 4524