static String encode(String word) {
        char[] charArray = word.toLowerCase().toCharArray();
        Set<Character> set = new HashSet<>();
        //ArrayList<Character> array = new ArrayList<>();
        StringBuilder result = new StringBuilder();
        for (char c : charArray) {
            if (set.contains(c)) {
                result.append(")");
            }
            else {
                result.append("(");
            }
            set.add(c);
        }

       /* for (int i = 0; i < charArray.length; i++) {
            if (!array.contains(charArray[i])) {
                result.append("(");
            } else {
                result.append(")");
            }
        }*/
        return result.toString();
    }