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

Example Input: Sentence: 'a man in a restaurant makes the v sign with both hands'. How many words contain the letter 'n' in the sentence.
Example Output: 5

Example Input: Sentence: 'a person that is wearing glasses looking into a mirror'. How many words contain the letter 'f' in the sentence.
Example Output: 0

Example Input: Sentence: 'the calf is brown and is standing in grass'. How many words contain the letter 'k' in the sentence.
Example Output:
0