STOP

import java.util.Scanner;

public class Stop {

	public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        repeatStr(n + 1, ".");
        repeatStr(2 * n + 1, "_");
        repeatStr(n + 1, ".");
        System.out.println();


        for (int row = 0; row < n; row++) {
            repeatStr(n - row, ".");
            System.out.print("//");
            repeatStr(2 * n + 2 * row - 1, "_");
            System.out.print("\\\\");
            repeatStr(n - row, ".");
            System.out.println();
        }

        System.out.print("//");
        repeatStr(2 * n - 3, "_");
        System.out.print("STOP!");
        repeatStr(2 * n - 3, "_");
        System.out.println("\\\\");

        for (int row = n; row > 0; row--) {
            repeatStr(n - row, ".");
            System.out.print("\\\\");
            repeatStr(2 * n + 2 * row - 1, "_");
            System.out.print("//");
            repeatStr(n - row, ".");
            System.out.println();

        }
    }

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

	}