import java.util.*;
import java.lang.*;
import java.io.*;
 
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		int num = sc.nextInt();
		Vector<Integer> v = new Vector<Integer>();
		for(int i=num; num>=1; num/=10)
		{
			v.add(num - (num/10)*10);
		}
		int arr[] = new int[v.capacity()];
		for(int i=0; i<v.capacity(); i++)
		{
			arr[i] = v.elementAt(i);
		}
		Arrays.sort(arr);
		reverse(arr);
 
	}
}

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