import java.util.Scanner;

public class stop {
    public static String repeatStr(String symbol, int n) {
        String text = "";
        for (int i = 0; i < n; i++) {
            text = text + symbol;
        }
        return text;
    }
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        int n = input.nextInt();

        int dots = n+1;

        int underScores = 2*n +1;

        System.out.printf("%s%s%s", repeatStr(".",dots),repeatStr("_", underScores),repeatStr(".", dots) );
        System.out.println();

        for(int i = 0; i<n; i++ ){
            System.out.printf("%s//%s\\\\%s", repeatStr(".",dots-1),repeatStr("_", underScores-2),repeatStr(".", dots-1) );
            System.out.println();
            underScores +=2;
            dots --;
        }

        System.out.printf("//%sSTOP!%s\\\\", repeatStr("_",(underScores-6)/2), repeatStr("_",(underScores-6)/2));
        System.out.println();


        for(int i = 0; i<n; i++ ){
            System.out.printf("%s\\\\%s//%s", repeatStr(".",dots-1),repeatStr("_", underScores-2),repeatStr(".", dots-1) );
            System.out.println();
            underScores -=2;
            dots ++;
        }



    }
}