PAT 乙级 1002 写出这个数 Java

import java.util.Scanner;

public class Main{
	public static void main(String args[]){
		Scanner scanner = new Scanner(System.in);
		String[] alphabet = {"ling","yi","er","san","si","wu","liu","qi","ba","jiu"};
		String string = scanner.next();
		int Num[] = new int[string.length()];
		int sum = 0;
		for(int i=0;i<string.length();i++){
			Num[i] = (int)(string.charAt(i))-48;
			sum=sum+Num[i];
		}
		String sumStr = Integer.toString(sum);
		for(int i=0;i<sumStr.length();i++){
			if(i<sumStr.length()-1){
                System.out.print(alphabet[(int)(sumStr.charAt(i))-48]+" ");
            }else{
                System.out.print(alphabet[(int)(sumStr.charAt(i))-48]);
            }
		}
	}
}