题解 | #提取不重复的整数#

import java.util.Scanner;
public class Main {
    public static String unRepeatedStr(String str) {

        String result = "";
        str = new StringBuilder(str).reverse().toString();

        //3766789
        for (int i = 0; i < str.length(); i++) {
            if (!result.contains(str.charAt(i) + "")) {
                result += str.charAt(i);
            }
        }

        return result;
    }

    public static void main(String agrs[]) {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();

        System.out.println(Main.unRepeatedStr(line));

    }
}