Problem 3: Write a function that takes in a string as input and returns a list of the unique characters used in the string. Punctuation should not be counted as a unique character. For our purposes you may consider the following characters as punctuation:.,;:?!"'- Your list should return all letters as lower case and sorted. So for example if the input is ' Happy days are here again! 'your function should return the list ['a 'r' 'y']

Problem 3: Write a function that takes in a string as input and returns a list of the unique characters used in the string. Punctuation should not be counted as a unique character. For our purposes you may consider the following characters as punctuation:.,;:?!"'- Your list should return all letters as lower case and sorted. So for example if the input is ' Happy days are here again! 'your function should return the list ['a 'r' 'y']

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter9: Completing The Basics

Section9.4: Character Manipulation Functions

Problem 6E

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