English Name Of The Last Digit

import java.util.Scanner;

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

        String numberAsString = scanner.nextLine();

        char lastDigit = numberAsString.toCharArray()[numberAsString.length() - 1];
        String output;

        switch (lastDigit) {
            case '0':
                output = "zero";
                break;
            case '1':
                output = "one";
                break;
            case '2':
                output = "two";
                break;
            case '3':
                output = "three";
                break;
            case '4':
                output = "four";
                break;
            case '5':
                output = "five";
                break;
            case '6':
                output = "six";
                break;
            case '7':
                output = "seven";
                break;
            case '8':
                output = "eight";
                break;
            case '9':
                output = "nine";
                break;

            default:
                output = null;
                break;
        }

        System.out.println(output);
    }
}