题解 | #图片整理#

import java.util.*;


public class Main {
    public static void main(String[] args) {
        Scanner fzhinput = new Scanner(System.in);
        String zfc = fzhinput.nextLine();
        StringBuilder stack = new StringBuilder();
        List<String> zm=new ArrayList<>();
        for(int i=0;i<zfc.length();i++){
            char c = zfc.charAt(i);
            zm.add(Character.toString(c));

        }
        Collections.sort(zm);
        for(int i=0;i<zm.size();i++){
            stack.append(zm.get(i));
        }
        System.out.print(stack.toString());
    }
}