public static List<String> bigSorting(List<String> unsorted) {
 
    Collections.sort(unsorted , new Comparator<String>() {
        @Override
        public int compare(String s1, String s2) {
            int length = s1.length() - s2.length();
            if(length != 0)
               return length;
                
            BigInteger n1 = new BigInteger(s1);
            BigInteger n2 = new BigInteger(s2);
            return n1.compareTo(n2);
            }
    });
    return unsorted; 
   }