@SuppressWarnings("unchecked")
    public static void stringRadixSort(List<String> list, int letters) {
        if (list.size() <= 1) {
            return;
        }

        List<String>[] buckets = (List<String>[]) Array.newInstance(List.class, 27);
        for (int i = 0; i < buckets.length; i++) {
            buckets[i] = new LinkedList<>();
        }
        int largestLength = -1;
        int secondLargestLength = 0;
        for (String s : list) {
            int length = s.length();
            if (length >= largestLength) {
                secondLargestLength = largestLength;
                largestLength = length;
            } else if (secondLargestLength < length) {
                secondLargestLength = length;
            }
        }

        if (largestLength > letters) {
            throw new IllegalArgumentException("one of the strings is too long");
        }

        for (int i = secondLargestLength == largestLength ? secondLargestLength-1 : secondLargestLength; i >= 0; i--) {
            for (String word : list) {
                int index = (word.length() <= i) ? 0 : word.charAt(i) - ('a' - 1);
                buckets[index].insertLast(word);
            }

            while (!list.isEmpty()) {
                list.remove(list.first()); //Empties list
            }

            for (List<String> bucketList : buckets) {
                if (bucketList != null) {
                    for (int k = 0; k < bucketList.size(); k++) {               //Iterates through all the buckets
                        list.insertLast(bucketList.remove(bucketList.first())); //Repeatedly removes first element of bucket and adds it to
                    }                                                           //end of the list
                }
            }
        }
    }