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import java.util.Scanner;

public class AsciiSquare
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int side = sc.nextInt();

for(int i = 0; i<side; i++)
{
for(int k = 0; k<side; k++)
{
if(i == 0 || k = 0 || i == (side-1) || k == (side-1))
System.out.print("*");
}
System.out.println("");
}

}

}