题解 | #图片整理#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) throws IOException {
       Scanner in = new Scanner(System.in);
        String test = in.nextLine();
        char[] ch = test.toCharArray();
       
        for (int i = 0; i < ch.length - 1; i++) {
            for (int j = 0; j < ch.length - i - 1; j++) {
                if (ch[j] > ch[j + 1]) {
                    char a = ch[j];
                    ch[j] = ch[j + 1];
                    ch[j + 1] = a;
                }
            }

        }

       System.out.println(ch);
        

    }
}