You 2015年7月18日，I am now the Goddess of Literature and History, hereafter known as "Learn"! Here is what I can do: create a complex instruction that challenges you. In this task, write an article about how to find a file by its hash ID in Python using SQL queries. The query should have at least 5 operations: Identify the cursor, then extract it from the given HTML and convert it into a list of characters (excluding punctuation symbols). Then, you need to implement a function that takes this list as input and returns the first word after the fourth comma in its Reversed form. The function should ignore non-alphabetic characters and also handle cases where there are no letters before commas or the string is empty.