Butterfly

import java.util.Scanner;

public class Butterfly {

     public static void main(String[] args) {

            Scanner scan = new Scanner(System.in);

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

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

            System.out.print(repeatStr(" ", n-1));
            System.out.println("@");

            for (int row = 0; row < n - 2; row++){
              if(row % 2 == 0){
                System.out.print(repeatStr("*", n - 2));
                System.out.print("/");
                System.out.print(" ");
                System.out.print("\\");
                System.out.println(repeatStr("*", n -2));
              }else {
                System.out.print(repeatStr("-", n - 2));
                System.out.print("/");
                System.out.print(" ");
                System.out.print("\\");
                System.out.println(repeatStr("-", n - 2));
              }
            }
        }
        static String repeatStr(String strToRepeat, int count) {
            String text = "";

            for (int i = 0; i < count; i++) {
                text = text + strToRepeat;
            }

            return text;
        }