题解 | #提取不重复的整数#

import java.util.Iterator;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) {
            StringBuilder sb1 = new StringBuilder(in.nextLine()).reverse();
            for (int i = 0; i < sb1.length(); i++) {
                for (int j = i+1; j < sb1.length(); j++) {
                    if(sb1.charAt(j)==sb1.charAt(i)) sb1.setCharAt(j,'x');
                }
                if(sb1.charAt(i)!='x') System.out.print(sb1.charAt(i));
            }
        }
        in.close();
    }
}