#define DEBUG 0

#include <bits/stdc++.h>
using namespace std;

#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}

// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
    public:
        template<typename T>
        _Debug& operator,(T val) {
            cout << val << endl;
            return *this;
        }
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif

// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back

// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;

// ---------- END OF TEMPLATE ----------

char a4[4][5] = {
    "aabd",
    "ccbd",
    "bdaa",
    "bdcc"
};
char a5[5][6] = {
    "aabbc",
    "b.ddc",
    "bd..a",
    "ad..a",
    "abbcc"
};
char a6[6][7] = {
    "aab.cc",
    "b.bc..",
    "baac..",
    ".ccaab",
    "c..b.b",
    "c..baa"
};
char a7[7][8] = {
    ".aabbcc",
    "a.dd.dd",
    "ad..d..",
    "bd..d..",
    "b.dd.dd",
    "cd..d..",
    "cd..d.."
};
char grid[1000][1000];
int main() {
    int N;
    cin >> N;

    if (N == 2) {
        printf("-1\n");
        return 0;
    }

    int i,j;
    memset(grid,'.',sizeof(grid));
    if ((N % 3) == 0) {
        for (i = 0; i < N; i += 3) {
            grid[i][i] = grid[i+1][i] = 'a';
            grid[i+2][i+1] = grid[i+2][i+2] = 'b';
        }
    }
    else {
        int m = N % 4;
        int c = m+4;
        if (m == 0) {
            for (i = 0; i < 4; i++) {
                for (j = 0; j < 4; j++) grid[i][j] = a4[i][j];
            }
        }
        else if (m == 1) {
            for (i = 0; i < 5; i++) {
                for (j = 0; j < 5; j++) grid[i][j] = a5[i][j];
            }
        }
        else if (m == 2) {
            for (i = 0; i < 6; i++) {
                for (j = 0; j < 6; j++) grid[i][j] = a6[i][j];
            }
        }
        else if (m == 3) {
            for (i = 0; i < 7; i++) {
                for (j = 0; j < 7; j++) grid[i][j] = a7[i][j];
            }
        }
        for (; c < N; c += 4) {
            for (i = 0; i < 4; i++) {
                for (j = 0; j < 4; j++) grid[c+i][c+j] = a4[i][j];
            }
        }
    }
    for (i = 0; i < N; i++) {
        for (j = 0; j < N; j++) printf("%c",grid[i][j]);
        printf("\n");
    }

    return 0;
}



Measured memory_bytes: 2176