/*
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 */
package quadradooco;

/**
 *
 * @author Michel
 */

import java.util.Scanner;

public class QuadradoOco {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner input = new Scanner(System.in);
        System.out.println("Input square length in UNITS");
        int length = input.nextInt();
        if (length < 0) {
            length *= -1;
        }
        int i = 1,
            f = 1;
        while ( i <= length ) {
            f = 1;
            while (f <= length) {
                if ( i == 1 || i == length || f == length || f == 1 ) {
                    System.out.print("#");
                    f++;
                }
                else {
                    System.out.print(" ");
                    f++;
                }
            }
        System.out.print("\n");
        i++;
        }
    }
}