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package com.todd.nowcoder;

import java.util.HashSet;

import java.util.Scanner;

/**

* @author tongchengdong

* @description HJ9 提取不重复的整数

* @date 9:44 PM 2022/7/2

*/

public class HJ9 {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

int num = scanner.nextInt();

char[] chars = (num + "").toCharArray();

String str = "";

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

if (!str.contains(chars[i] + "")) {

str += chars[i];

}

}

System.out.println(Integer.valueOf(str));

}

// public static void main(String[] args) {

// Scanner sc = new Scanner(System.in);

// while(sc.hasNext()){

// // 使用HashSet来判断是否是不重复的

// HashSet<Integer> hs = new HashSet<>();

// int target = sc.nextInt();

// while(target != 0){

// int temp = target % 10;

// if(hs.add(temp)) {

// System.out.print(temp);

// }

// target /= 10;

// }

// System.out.println();

// }

// }

}