#include <stdio.h>

int main() {
    int n,j,i;
    while(~scanf("%d",&n))
    {
        for(i=1;i<=n;i++)
        {
            for(j=1;j<=n;j++)
            {
                if(i==1||i==n||j==1||j==n) printf("* ");
                else printf("  ");
            }
            printf("\n");
        }
    }
    return 0;
}