Problem A. License plate

plate.java

class plate {
    public static void main (String[] args) {
	String input = System.console().readLine();
	String word = "";

	for (int i = 0; i < input.length(); i++) {
	    if (input.charAt(i) == ' ') {
		check (word);
		word = "";
	    } else if (i == input.length() - 1) {
		word += input.charAt(i);
		check (word);
	    } else {
		word += input.charAt(i);
	    }
	}
    }

    private static void check (String input) {
	int s_to_n = Integer.parseInt(input);
	if (s_to_n > 0 && s_to_n < 10) {
	    System.out.println(input);
	} else if (palindrome (input)) {
	    System.out.println(input);
	} else if (s_to_n >= 100 && s_to_n % 100 == 0) {
	    System.out.println(input);
	} else if (s_to_n > 1000 && input.substring(0, 1).equals(input.substring(2, 3))) {
	    System.out.println(input);
	} else if (s_to_n > 100 && (checkLtoH(input) || checkHtoL(input))) {
	    System.out.println(input);
	}
    }

    private static boolean palindrome (String input) {
	for (int i = 0; i < input.length()/2; i++) {
	    if (input.charAt(i) != input.charAt(input.length() - i - 1)) {
		return false;
	    }
	}
	return true;
    }

    private static boolean checkLtoH (String input) {
	for (int i = 0; i < input.length() - 1; i++) {
	    if (input.charAt(i) - input.charAt(i + 1) != -1) {
		return false;
	    }
	}
	return true;
    }

    private static boolean checkHtoL (String input) {
	for (int i = 0; i < input.length() - 1; i++) {
	    if (input.charAt(i) - input.charAt(i + 1) != 1) {
		return false;
	    }
	}
	return true;
    }
	    
}