#include <stdio.h>

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