$($Counting Duplicate Words$-10$ points$)$ Write a script that uses a dictionary to determine and print the number of duplicate words in a sentence. Treat uppercase and lowercase letters the same and assume there is no punctuation in the sentence. Use the techniques you learned in Section $6\mathrm{.}2\mathrm{.}7.$ Words with counts larger than $1$ have duplicates

$($Character Counts $-10$ points$)$ Recall that strings are sequences of characters. Use techniques similar to Fig. $6\mathrm{.}2$ to write a script that inputs a sentence from the user, then uses a dictionary to summarize the number of occurrences of each letter. Ignore case, ignore blanks and assume the user does not enter any punctuation. Display a two$-$column table of the letters and their counts with the letters in sorted order.

Bonus $-2$points: Use a set operation to determine which letters of the alphabet were not in the original string $.$

Deliverables:

Your source code file $(.$ipynb or $.$py$)$

A screenshot of your source code along with the output result