import java.util.Arrays;

class Solution {
    public String solution(int[] numbers) {
        String[] arr = new String[numbers.length];
        for(int i=0;i<numbers.length;++i)
        {
            arr[i] = String.valueOf(numbers[i]);
        }
         Arrays.sort(arr, (o1,o2)->
        {
            if(o1.length()==o2.length()) return o2.compareTo(o1);
            return Integer.compare(Integer.parseInt(o2+o1),Integer.parseInt(o1+o2));
        });
        StringBuilder sb = new StringBuilder();
        for(String str : arr)
        {
            sb.append(str);
        }
        for(int i=0;i<sb.length()-1;i++)
        {
            if(sb.charAt(i)!='0') break;
            sb.deleteCharAt(i);
            i--;
        }
        return sb.toString();
    }
}