import java.util.Scanner;

public class зада {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int i = 0;
//first row
        while (i < n + 1) {
            System.out.print(".");
            i++;
        }

        i = 0;
        while (i < n * 2 + 1) {
            System.out.print("_");
            i++;
        }
        i = 0;
        while (i < n + 1) {
            System.out.print(".");
            i++;
        }
        System.out.println();
        // second row
        int dots = n;
        int underscore = n * 2 - 1;
        int rows = 0;

        while (rows < n) {
            i = 0;
            while (i < dots) {
                System.out.print(".");
                i++;
            }
            System.out.print("//");
            i = 0;
            while (i < underscore) {
                System.out.print("_");
                i++;
            }
            System.out.print("\\\\");
            i = 0;
            while (i < dots) {
                System.out.print(".");
                i++;
            }
            System.out.println();
            dots--;
            underscore += 2;
            rows++;
        }
        // STOP!
        System.out.print("//");
        i = 0;
        while (i < (underscore - 5) / 2) {
            System.out.print("_");
            i++;
        }
        System.out.print("STOP!");
        i = 0;
        while (i < (underscore - 5) / 2) {
            System.out.print("_");
            i++;
        }
        System.out.println("\\\\");
        //last  row
        dots = 0;
        rows = 0;
        int underscore1 = n * 4 - 1;
        while (rows < n) {
            i = 0;
            while (i < dots) {
                System.out.print(".");
                i++;
            }
            System.out.print("\\\\");
            i = 0;
            while (i < underscore1) {
                System.out.print("_");
                i++;
            }
            System.out.print("//");
            i = 0;
            while (i < dots) {
                System.out.print(".");
                i++;
            }
            System.out.println();
            dots++;
            underscore1-=2;
            rows++;
        }
    }
}