/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int num = 8756404;
		int[] times = new int[10];
		while(true){
			if(num==0){
				break;
			}
			int val = num%10;
			times[val]++;
			num /= 10;
		}
		for(int i=9; i>=0; i--){
			for(int j=0; j<times[i]; j++){
				System.out.print(i);
			}
		}
		System.out.println();
	}
}

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