#include <stdio.h>
 
int main() {
    int n;
    scanf("%d", &n);
 
    char simbolos[52] = {
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
        'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
        'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
    };
 
    int dimensao = 2 * n + 1;
    char matriz[104][104];
 
    for (int i = 0; i < dimensao; i++) {
        for (int j = 0; j < dimensao; j++) {
            matriz[i][j] = ' ';
        }
    }
 
    for (int camada = 0; camada < n; camada++) {
        char caractere = simbolos[camada];
 
        for (int i = camada; i < dimensao - camada; i++) {
            for (int j = camada; j < dimensao - camada; j++) {
                matriz[i][j] = caractere;
            }
        }
    }
 
    matriz[n][n] = '*';
 
    for (int i = 0; i < dimensao; i++) {
        for (int j = 0; j < dimensao; j++) {
            printf("%c", matriz[i][j]);
            if (j != dimensao - 1) printf(" ");
        }
        printf("\n");
    }
 
    return 0;
}
 

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