PRE-WRITTEN PYTHON FUNCTIONS YOU CAN USE IN A4 (ALTHOUGH NOT MANDATORY)
1) isalpha()
2) isupper()
3) ord()
4) islower()
5) lower()
6) chr()
7) len()

Also the following functions can be used in A4 (they could be used in previous assignments as well)
* input (obvious)
* print (obvious)