public static String helper(String input)
    {
        if(input.equals(""))return input;
        int n = 0;
        String character = input.substring(n, n + 1);
        char first = input.charAt(0);

        if (n == input.length())
            input = input;
        else if (((char)(first) >= 65) && ((char)(first) <= 90))
        {
            input = input.replaceAll(character, character.toLowerCase());
            n++;
            input = helper(input);
        }
        else if((char)(first) == 32 || (char)(first) == 44 || (char)(first) == 46)
        {
            input = input.replaceAll(character, character.replace("[,. ]", ""));
            n++;
            input = helper(input);
        }
        else
        {
            n++;
            input = input.charAt(0) + helper(input.substring(1, input.length()));
        }

        return input;
    }