barcode validation

import java.sql.Array;
import java.util.*;

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

        int inputsCount = Integer.parseInt(scan.nextLine());
        while (inputsCount > 0) {
            StringBuilder input = new StringBuilder(scan.nextLine());
            StringBuilder group = new StringBuilder();
            boolean valid = true;

            //validation #1
            for (int i = 0; i < input.length(); i++) {
                if (i == 0 && input.charAt(i) != '@') {
                    valid = false;
                } else if (i == 1 && input.charAt(i) != '#') {
                    valid = false;
                } else if (i == input.length() - 1 && input.charAt(i) != '#') {
                    valid = false;
                }
            }

            int br = 1;
            int index1 = 0;
            int index2 = 0;
            //remove the first series of "@#..."
            if (valid) {
                while (input.charAt(br) == '#') {

                    index1++;
                    br++;
                }
            }

            input.replace(0, index1 + 1, "").reverse();
            //remove the last series of "@#..."
            if (valid) {
                br = 0;
                while (input.charAt(br) == '#') {

                    index2++;
                    br++;
                }
            }
            //validation #2
            if (input.charAt(br) != '@') {
                valid = false;
            }
            input.replace(0, index2 + 1, "").reverse();
            //validation #3
            if (input.length() < 6) {
                valid = false;
            }
            //validation #4
            char firstLetter = input.charAt(0);
            if (!Character.isUpperCase(firstLetter)) {
                valid = false;
            }
            //validation #5
            for (int i = 0; i < input.length(); i++) {
                if (!Character.isLetterOrDigit(input.charAt(i))) {
                    valid = false;
                }
            }
            //validation #6
            char lastLetter = input.charAt(input.length() - 1);
            if (!Character.isUpperCase(lastLetter)) {
                valid = false;
            }

            for (int i = 0; i < input.length(); i++) {
                if (Character.isDigit(input.charAt(i))) {
                    group.append(input.charAt(i));
                }
            }
            if(group.isEmpty()){
                group.append("00");
            }
            if (valid) {
                System.out.println("Product group: " + group);
            }
            else{
                System.out.println("Invalid barcode");
            }
            inputsCount--;
        }

    }
}
/*
3
@#FreshFisH@#
@###Brea0D@###
@##Che4s6E@##
 */