Пеперуда

import java.util.Scanner;

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

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

        for (int i = 1; i <= n - 2; i++) {

            if(i % 2 != 0){
                System.out.println(repeatStr("*", n - 2)
                        + "\\ /"
                        + repeatStr("*", n - 2));
            }else{
                System.out.println(repeatStr("-", n - 2)
                        + "\\ /"
                        + repeatStr("-", n - 2));
            }
        }
        System.out.println(repeatStr(" ", n - 1)
                + "@"
                + repeatStr(" ", n -1));

        for (int i = 1; i <= n - 2; i++) {

            if(i % 2 != 0){
                System.out.println(repeatStr("*", n - 2)
                        + "/ \\"
                        + repeatStr("*", n - 2));
            }else{
                System.out.println(repeatStr("-", n - 2)
                        + "/ \\"
                        + repeatStr("-", n - 2));
            }
        }
    }

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