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

Example Input: Sentence: 'a toilet sits in the middle of a street'. How many words contain the letter 'b' in the sentence.
Example Output: 0

Example Input: Sentence: 'a person skiing down part of a marked race course'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'a toddler riding a toy vehicle by a fire hydrant'. How many words contain the letter 'r' in the sentence.
Example Output:
4