[백준] 1427번 소트인사이드

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner kb = new Scanner(System.in);
		String s = kb.next();
		String[] arr = s.split("");
		List<Integer> list = new ArrayList<>();
		
		for(int i=0; i<arr.length; i++) {
			list.add(Integer.parseInt(arr[i]));
		}
		Collections.sort(list);
		Collections.reverse(list);
		
		for(int x: list) {
			System.out.print(x);
		}
	}
		

}