#include <stdio.h>

int main(){
	int row=0,size,counter=0,counter1=0;
	scanf("%d",&size);
	while(row<size){
		if(row==0 | row == (size-1)){
			while(counter<size){
				printf("*");
				counter++;
			}
			counter=0;
			printf("\n");
			row++;
		}
		else{
			while(counter1 < size){
				if(counter1 == 0 | counter1 == (size-1)){
					printf("*");
				}
				else{
					printf(" ");
				}
				counter1++;
			}
			row++;
			counter1=0;
			printf("\n");
		}
	}
	return 0;
}