输入一个int型整数，按照从右向左的阅读顺序，返回一个不含重复数字的新的整数。 保证输入的整数最后一位不是0。

import java.util.ArrayList;
import java.util.Scanner;

public class Main{

public static void main(String[] args) {

    Scanner scanner = new Scanner(System.in);
    int nextInt = scanner.nextInt();

    String s = String.valueOf(nextInt);

    char[] chars = s.toCharArray();

    ArrayList arrayList = new ArrayList();

    StringBuilder stringBuilder = new StringBuilder();
    for (int i = chars.length - 1; i >= 0; i--) {

        if (!arrayList.contains(chars[i])) {
            arrayList.add(chars[i]);
            stringBuilder.append(chars[i]);
        }

    }

    System.out.println(stringBuilder.toString());


}

}