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

Example Input: Sentence: 'a woman riding a motorcycle down a busy city street'. How many words contain the letter 'w' in the sentence.
Example Output: 2

Example Input: Sentence: 'this bus waits at a bus station for passengers to board'. How many words contain the letter 'e' in the sentence.
Example Output: 1

Example Input: Sentence: 'a dark street with lit shops on either side'. How many words contain the letter 'r' in the sentence.
Example Output:
3