Write a function called count_vowels() using what we learned this week about Strings. Here are the requirements:

1. function count_vowels takes a parameter of a String type: count_vowels(mystr)

2. function count_vowels returns a integer of how many vowels there are in the string parameter

3. a vowel is any letter in a, e, i, o, u, A, E, I, O, U

4. function count_vowels collects all the vowels in the string parameter, and prints out all the vowels in one line at the end.

5. here's an example of calling the function and the output:

>>> count = count_vowels("banana")

aaa

>>> count

3

[Checkpoint] Submit the python code (the .py file) in text format, and the screen capture of calling your function with at least two different string arguments and the output. Make sure your program works before submiting it.