Write a function in Python 3, wordCounts, that takes in a string, aStr, as input and returns a dictionary of each word in aStr with the corresponding frequency of that word.(Note: Hi and hi should be counted as the same word)

Use a string method to remove all periods and commas from the aStr before processing

Use a string method to remove all non alphabetic characters from the string before processing

Ex. Input : Hi friend. hi there friend. there there, no worries

Output: {hi:2, friend:2, there:3, no:1, worries:1}