TheExplorer

import java.util.Scanner;

public class TheExplorer {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int dashesIncreasing = n / 2;
        int dashesDecreasing = n / 2;

        //top line
        System.out.print(new String(new char[n/2]).replace('\0', '-'));
        System.out.print('*');
        System.out.println(new String(new char[n/2]).replace('\0', '-'));

        //upper middle
        for (int i = 0; i < n/2 - 1; i++) {

            System.out.print(new String(new char[dashesDecreasing - 1]).replace('\0', '-'));
            System.out.print('*');
            System.out.print(
            new String(new char[dashesIncreasing  - (n/2 - 1)]).replace('\0', '-'));
            System.out.print('*');
            System.out.println(new String(new char[dashesDecreasing - 1]).replace('\0', '-'));

            dashesIncreasing+=2;
            dashesDecreasing--;
        }

        //middle
        System.out.print('*');
        System.out.print(new String(new char[n - 2]).replace('\0', '-'));
        System.out.println('*');

        dashesDecreasing = n - 2;
        dashesIncreasing = 1;

        //lower middle
        for (int i = 0; i < n/2 - 1; i++) {

            System.out.print(new String(new char[dashesIncreasing]).replace('\0', '-'));
            System.out.print('*');
            System.out.print(new String(new char[dashesDecreasing - 2]).replace('\0', '-'));
            System.out.print('*');
            System.out.println(new String(new char[dashesIncreasing]).replace('\0', '-'));

            dashesDecreasing-=2;
            dashesIncreasing++;
        }

        //bottom line
        System.out.print(new String(new char[n/2]).replace('\0', '-'));
        System.out.print('*');
        System.out.println(new String(new char[n/2]).replace('\0', '-'));
    }
}