Python 3 code and comment please.

Sentence Capitalizer

Design a program that prompts the user to enter a string containing multiple senteces, and then display the string with the first character of each sentence capitalized.

Example:

If user enters "hello. my name is Joe. what is your name?"

The program should display:

"Hello. My name is Joe. What is your name?"

(Hint: The toUpper library function can be used to covert a single character to upper case.)