백준 11단계 no.5

import java.io.*;
import java.util.*;

public class Main {
    static void swap (char[] arr, int a, int b) {
        char temp = arr[a];
        arr[a] = arr[b];
        arr[b] = temp;
    }

    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);

        String n = sc.next();
        char[] arr = new char[n.length()];
        for (int i = 0; i < n.length(); i++) {
            arr[i] = n.charAt(i);
        }

        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr.length; j++) {
                if (arr[i] > arr[j]) {
                    swap(arr, i, j);
                }
            }
        }

        String str = new String(arr);
        System.out.println(str);
    }
}