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

int main()
{
    char m[100][100];
    int n;
    cin >> n;

    for (int i = 0; i < n; i++)
    {
        m[i][i] = '!', m[i][n - i - 1] = '!';
        for (int j = 0; j < n; j++)
        {
            if (i < n/2)
            {
                if (j > i && j < n - i - 1)
                    m[i][j] = 'a';
                else if (j < i)
                    m[i][j] = 'm';
                else if (j > n - i - 1)
                    m[i][j] = 'k';
            }
            else
            {
                if (j > n - i - 1 && j < i)
                    m[i][j] = 'b';
                else if (j < n - i - 1)
                    m[i][j] = 'm';
                else if (j > i)
                    m[i][j] = 'k';
            }
        }
    }

    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
            cout << m[i][j] << " ";
        cout << endl;
    }
    return 0;
}