// This program demonstrates nested for loops
// Get an integer number from the user, 
// draw a triangle of stars


// need this import for reading data:
import java.io.*;

public class Triangles {

    public static void main (String [] args)  throws IOException {
	// Create a buffered reader
	// need only one buffered reader for all your reading
	BufferedReader in = new BufferedReader(
			new InputStreamReader(System.in));
	// string for storing a line of input
	String line;

	// Read one integer
	// prompt the user:
        System.out.print("Please enter an integer: ");
	// read a line of input:
	line = in.readLine();
	// extract the integer from the entered data:
	int n = Integer.parseInt(line);

	// upper left:
	for (int i = 0; i < n; ++ i) {
	    for (int j = 0; j < n - i; ++ j)
		System.out.print("*");
	    System.out.println();
	}

	// lower left:
	for (int i = 0; i < n; ++ i) {
	    for (int j = n - i - 1; j < n; ++ j)
		System.out.print("*");
	    System.out.println();
	}
    }
}