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());

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

        for (int i = 0; i <n ; i++) {
            String loop1 = repeatStr(".", n - i)
                    + "//"
                    + repeatStr("_", 2*n - 1 + i + i)
                    + "\\\\"
                    + repeatStr(".", n - i);
            System.out.println(loop1);
        }

        String stopLine = "//"
                + repeatStr("_", (4*n -6)/2)
                + "STOP!"
                + repeatStr("_", (4*n -6)/2)
                + "\\\\";
        System.out.println(stopLine);

        String afterStopLine = "\\\\"
                + repeatStr("_", 4*n -1)
                + "//";
        System.out.println(afterStopLine);

        for (int i = 1; i <=n-1 ; i++) {

            String loop2 = repeatStr(".", i)
                    + "\\\\"
                    + repeatStr("_", 4*n - 1 - 2*i)
                    + "//"
                    + repeatStr(".", i);
            System.out.println(loop2);


        }
    }


    static String repeatStr(String strToRepeat, int count) {
        String text = "";
        for (int i = 0; i < count; i++) {
            text += strToRepeat;
        }
        return text;
    }
}