FancyBarcodes

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class FancyBarcodes {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine());
        for (int i = 0; i < n; i++) {
            String barcode = sc.nextLine();
            Pattern pattern = Pattern.compile("@(#+)(?<barcode>[A-Z][A-Za-z0-9]{4,}[A-Z])\\b@(\\1)");
            Matcher matcher = pattern.matcher(barcode);
            StringBuilder productGroup = new StringBuilder();
            int secondCounter = 0;
            int counter = 0;
            String newBarcode = "";


            if (!matcher.matches()) {
                System.out.println("Invalid barcode");
            }

            if (matcher.matches()) {
                newBarcode = matcher.group("barcode");
                for (int j = 0; j < newBarcode.length(); j++) {
                    char a = newBarcode.charAt(j);
                    if (Character.isDigit(a)) {
                        productGroup.append(a);
                        secondCounter++;
                    } else {
                        counter++;
                    }
                }
                if (secondCounter > 0) {
                    counter = 0;
                }

                if (counter > 0) {
                    System.out.println("Product Group: 00");
                } else {
                    System.out.printf("Product Group: %s%n", productGroup);
                }
            }
        }
    }
}