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', 'd','e','g','h','i','n', 'p','r','s','y']

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', 'd','e','g','h','i','n', 'p','r','s','y']

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter17: Linked Lists

Section: Chapter Questions

Problem 8PE

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