This code run for intelliJ IDEA and output will be run successfully. But not for HackerRank Solution. output is generate None.

public static void main(String[] args) { // Input: Number of lines followed by the lines of text Scanner scanner = new Scanner(System.in); int n;

    try {
        n = Integer.parseInt(scanner.nextLine().trim()); // Read the number of lines
    } catch (NumberFormatException e) {
        System.out.println("Invalid input for number of lines. Please provide a valid integer.");
        return;
    }

    String[] lines = new String[n];

    for (int i = 0; i < n; i++) {
        lines[i] = scanner.nextLine(); // Read each line
    }
    scanner.close();

    // Process each line and extract valid content
    for (String line : lines) {
        if (line == null || line.isEmpty()) {
            System.out.println("None");
            continue;
        }
        extractValidContent(line);
    }
}

public static void extractValidContent(String line) {
    // Regex to match valid tags and their contents

// String regex = "<([a-zA-Z0-9\s]+)>(.*?)"; String regex = "<(.+)>([^<]+)"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(line); boolean found = false;

    while (matcher.find()) {
        String content = matcher.group(2);

        // Check if content is not nested
        if(content.contains("<")){
            System.out.println(content);
            found = true;
        }
    }

    if (!found) {
        System.out.println("None");
    }
}

}