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

Example Input: Sentence: 'a stop sign casting a shadow of a sign that says war'. How many words contain the letter 'y' in the sentence.
Example Output: 1

Example Input: Sentence: 'a woman is posing next to a stop sign'. How many words contain the letter 'u' in the sentence.
Example Output: 0

Example Input: Sentence: 'a very nicely arranged urn of flowers on a table'. How many words contain the letter 't' in the sentence.
Example Output:
1