In this task, you need to count the number of words in a sentence that contain the given letter

Example Input: Sentence: 'ancient pottery being displayed on an exhibit case'. How many words contain the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'a plate with a grilled sanwich next to a bowl of tomato soup'. How many words contain the letter 'a' in the sentence.
Example Output: 6

Example Input: Sentence: 'a loaf of raisin bread sitting on top of a napkin next to chocolate covered bread'. How many words contain the letter 'b' in the sentence.
Example Output:
2