Attack on leetcode.com: string manipulations-easy mode #3

Time for our third battle!
After setting up and short presentations, we will go to leetcode.com and try to solve two exercises.

The exercises should be doable for an average python user, still they will be challenging. You will learn something!
( you should know basic string manipulation functions such as join(), strip() but no advance knowledge is expected)

< The video link will be shared before the event. >

Let's do this! =]