/* 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
	{
		// your code goes here
		int arr[]={1,2,9,98,10};
		ArrayList<Integer> lst = new ArrayList<Integer>();
		for(int i=0;i<arr.length;i++)
			lst.add(arr[i]);
 
		Collections.sort(lst,new Comparator<Integer>(){
			@Override
	        public int compare(Integer x,Integer y) { 
 
	        // first append Y at the end of X 
	        String XY=x +""+ y; 
 
	        // then append X at the end of Y 
	        String YX=y +""+ x; 
 
	        // Now see which of the two formed numbers  
	        // is greater 
	        return XY.compareTo(YX) > 0 ? -1:1; 
	    	}
		});
		for(int i=0;i<lst.size();i++){
			System.out.print(lst.get(i));
		}
	}
}

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