Rather than hard-coding the index for the last student

https://github.com/SayedAliMajed/python-data-structures-lab/blob/5d9384029236672036493ba763e450bd797b025f/exercises.py#L28

You want to access the list based on the assumption that you do not know its length, and thus are unaware of which index the last student is at. Thus:

```
last_student = students[-1] 
```