Java Fundamentals - Digits, Letters and Other

import java.util.Scanner;

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

        String input = scanner.nextLine();
        for (int i = 0; i < input.length(); i++) {
            if (Character.isDigit(input.charAt(i))){
                System.out.print(input.charAt(i));
            }
        }
        System.out.println();

        for (int i = 0; i < input.length(); i++) {
            if (Character.isLetter(input.charAt(i))){
                System.out.print(input.charAt(i));
            }
        }
        System.out.println();

        for (int i = 0; i < input.length(); i++) {
            if (!Character.isLetterOrDigit(input.charAt(i))){
                System.out.print(input.charAt(i));
            }
        }

    }
}