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-> To : mcu13321

How does it even work ? Makes on sense
Please Explain what is special about 10

is there a reason why you didn't use .lower() function ?

Damn, no need to compare their value from 5, if 1 then it will give 0 and if 9 then 1, and their are only 10 nums then damn and you don't need to import and use str(replaced string, now string is used for a different purpose)

Nice... :()

\d+ and [0-9]+ are patters, \d+ is just a more clean and good

Adding () will improve to read what is happening but, clever just genearte with X in middle

This is a clean code, easily expndable and aesily readable

Why convert string to string ????

Perfection

Good:\n
Clean code and Readibilty are crying in nano(If you know what it means then accept it, vim is superior)

Unenecssery