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

Example Input: Sentence: 'a person is riding a bicycle on the street'. How many words contain the letter 'b' in the sentence.
Example Output: 1

Example Input: Sentence: 'a fresh flower on a table in a piture of water'. How many words contain the letter 'n' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man in white shirt on skateboard in a street'. How many words contain the letter 'v' in the sentence.
Example Output:
0