#include <stdio.h>

int main() {
int n;
for (inti=1;i<=n;i++){
    for(int j=1;j<=n;j++){
        if(i==1||1==n||j==1||j==n){
            printf("* ");
        }else{
            printf(" ");
        }
        }
    printf("\n");
}
return 0;
}