/*N=5 i space digit

* * * * * 1 4 1

* * 2 3 2

* * 3 2 3

* * 4 1 4

* * * * * 5 0 5

1 2 3 4 5 i n-i i

*/

import java.util.Scanner;

public class Ptrn39

{

public static void main(String[] args)

{

Scanner sc=new Scanner(System.in);

System.out.println("enter the no of lines: ");

int n=sc.nextInt();

for(int i=1;i<=n;i++) //row

{

for(int j=1;j<=n;j++) //space

{

if(i==1||j==1||i==n||j==n)

System.out.print("* ");

else

System.out.print(" ");

}

System.out.println();

sc.close();

}

}

}