$$ All code should appear in the Python code files.

$$ In the code document, arrange your code as in the following order:

$($a$)$ Six functions for $6$ letters $($the order must be $$C$,$A$,$T$,$D$,$ O$$ and $$G$)$

$($b$)$ One function for a word with multiple letters $($COAT$,$DOG$$ and $$DATA$$

$($no need to be a real word$)$ and so on$)$ is efficiently organized by calling functions

from the six functions mentioned above $($challenge task$).$

$*$Some students may be able to design a function including both $($a$)$ and $($b$).$ For

assessment purposes, please separate them as the requirement.

$($c$)$ Main code

$$ Variable and function identifiers should follow appropriate conventions.

$$ Code is indented appropriately and grouped in blocks according to the common tasks

they share.

$$ Appropriate comments should be added to all blocks of code. Do not simply translate

the syntax into English for comments, instead, describe the purpose of the code.

Docstring comments are required for each def function code.