题解 | #图片整理#

import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        char[] obs = str.toCharArray();
        Arrays.sort(obs);
        for(Object o : obs){
            System.out.print(o);
        }
     }
}