Scanner scanner = new Scanner(System.in);

        if (scanner.hasNext()) {
        String value = scanner.nextLine();
        System.out.println(Identifier + value);
    } else if (scanner.hasNextInt()) {
        int intValue = scanner.nextInt();
        System.out.println(Identifier + intValue);
    } else if (scanner.hasNextDouble()) {
        double doubleValue = scanner.nextDouble();
        System.out.println(Identifier + doubleValue);
    }