Theme_6.1_stop

import java.util.Scanner;

class Main {
   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();
       //rows after first row

       int leftDots = n;
       int underscore = n * 2 - 1;
       int rightDots = n;
       int l = n * 4 - 1;
       int lastRow = n - 1;

       int rows = 0;
       while (rows < n) {
           i = 0;
           while (i < leftDots) {
               System.out.print(".");
               i++;
           }
           System.out.print("//");
           i = 0;
           while (i < underscore) {
               System.out.print("_");
               i++;
           }
           System.out.print("\\\\");
           i = 0;
           while (i < rightDots) {
               System.out.print(".");
               i++;
           }
           System.out.println();
           leftDots--;
           rightDots--;
           underscore += 2;
           rows++;
       }
       //mid

       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.print("\\\\");
       System.out.println();
       //last rows
       rows =0;
       while (rows < n) {
           i = 0;
           while (i < leftDots) {
               System.out.print(".");
               i++;
           }
           System.out.print("\\\\");
           i = 0;
           while (i < underscore) {
               System.out.print("_");
               i++;
           }
           System.out.print("//");
           i = 0;
           while (i < rightDots) {
               System.out.print(".");
               i++;
           }
           System.out.println();
           leftDots++;
           rightDots++;
           underscore -= 2;
           rows++;
       }
   }
}