Wasn't this supposed to change the paragraf?

Question

https://code.sololearn.com/Wr4Tc7lXofu6/#

Answer 1

I put comments in here to show the issues:
https://code.sololearn.com/WU5aAqW10YSA/?ref=app

Answer 2

Thank you. I thought that when there's only one paragraph you don't need to put [0]