Write a function extract_num() in python that takes two parameters: a file-name and an integer (x). The function should do the following:

1. Read the input file- entirely at once or line by line (use either: readline() or read()).

2. Create a list (lst1) which contains all words (strings) from the file as its elements. (use: split())

3. Create a new list (lst2) which contains all integers from lst1 which are greater than x. (use: int() to convert words that are strings into integers)

4. Find and print the maximum value from lst2 (do not use max() function)

5. Return lst2

(Python)