Stop

import java.util.Scanner;

public class Stop {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

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

        int width = n * 5 - (n - 3);
        int leftRight = n + 1;
        int middle = width - leftRight * 2;

        System.out.printf("%s%s%s\n",
                repeatChar(leftRight, '.'),
                repeatChar(middle, '_'),
                repeatChar(leftRight, '.'));

        middle -= 2;
        for (int i = 0; i < n; i++) {
            leftRight--;

            System.out.printf("%s//%s\\\\%s\n",
                    repeatChar(leftRight, '.'),
                    repeatChar(middle, '_'),
                    repeatChar(leftRight, '.'));

            middle += 2;
        }

        int inside = (middle - 5) / 2;

        System.out.printf("//%sSTOP!%s\\\\\n",
                repeatChar(inside, '_'),
                repeatChar(inside, '_')
                );

        leftRight = 0;

        for (int i = 0; i < n; i++) {
            System.out.printf("%s\\\\%s//%s\n",
                    repeatChar(leftRight, '.'),
                    repeatChar(middle, '_'),
                    repeatChar(leftRight, '.'));
            leftRight++;
            middle -= 2;
        }
    }

    private static String repeatChar(int n, char ch){
        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < n; i++) {
            sb.append(ch);
        }

        return sb.toString();
    }
}