public class MyClass {
    public static void main(String args[]) {
        int maxStars = 55;
        int gaps = maxStars/2 - 1;
        for(int i = 1; i < maxStars; i=i+2) {
                for (int p = 0; p <=gaps;p++) {
                    System.out.print(" ");
                }
                for (int j = 0; j < i; j++) {
                System.out.print("*");
                }
                for (int p = 0; p <=gaps;p++) {
                    System.out.print(" ");
                }
                gaps--;
                System.out.println("");
        }
        gaps = 0;
        for(int i = maxStars; i <= maxStars; i=i-2) {
            for (int p = 0; p <gaps;p++) {
                    System.out.print(" ");
            }
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            for (int p = 0; p <gaps;p++) {
                    System.out.print(" ");
            }
            gaps++;
            System.out.println("");
        }
    }
}