题解 | #图片整理#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.time.LocalDateTime;
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.Stream;

import static java.util.stream.Stream.*;

public class Main {
    public static void main(String[] args) throws IOException {

        //testCompletePack();
        testTh();
    }

    private static void testTh() throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        String str;
        StringBuilder sb = new StringBuilder();
        while ((str = bf.readLine()) != null) {
            char[] chars = str.toCharArray();
            ArrayList<Character> al = new ArrayList<>();
            for (int i = 0; i < chars.length; i++) {
                al.add(chars[i]);
            }
            al.stream().sorted().forEach(System.out::print);

        }
    }

}