05. Hourglass

import java.util.Scanner;

public class Hourglass
{
    public static void main(String[] args)
    {
        Scanner console = new Scanner(System.in);
        StringBuilder sb = new StringBuilder(".");

        int n = Integer.parseInt(console.nextLine());
        int size = 2 * n + 1;

        String bottom = new String(new char[size]).replace("\0", "*");
        String sand = " ";

        System.out.println(bottom);

        for (int row = 0; row < size / 2; row++)
        {
            System.out.print(sb + "*");
            printStr(sand, size - sb.length() - row - 3);
            System.out.println((row < size / 2 - 1) ? "*" + sb : sb);
            sb.append(".");
            sand = "@";
        }

        for (int row = 0; row < size / 2 - 1; row++)
        {
            printStr(".", size / 2 - row - 1);
            System.out.print("*");

            if (row < size / 2 - 2)
            {
                printStr(" ", row);
                printStr("@", 1);
                printStr(" ", row);
            }
            else {
                printStr("@", size - 4);
            }

            System.out.print("*");
            printStr(".", size / 2 - row - 1);
            System.out.println();
        }
        System.out.println(bottom);
    }

    public static void printStr(String str, int count)
    {
        for (int i = 0; i < count; i++)
        {
            System.out.print(str);
        }
    }
}