Why the output is showing none in this program?

Question

https://code.sololearn.com/cB7pbRJmyHlb/?ref=app
https://code.sololearn.com/cB7pbRJmyHlb/?ref=app

Answer 1

// You have created variable called "n" in the second line.

Solved:
// https://code.sololearn.com/c8orKWI9RmED/?ref=app

Answer 2

You can see two possible solutions in the code below.
https://code.sololearn.com/cfjZy451dUFo/?ref=app
Hope it helps you.

Answer 3

Print (num)
sort(reverse=True)

Answer 4

Thanks