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

Example Input: Sentence: 'black and white photo of old man riding a motorcycle'. How many words contain the letter 'n' in the sentence.
Example Output: 3

Example Input: Sentence: 'a sign asking for witnesses is posted in front of a destroyed home'. How many words contain the letter 'y' in the sentence.
Example Output: 1

Example Input: Sentence: 'a half a pizza sitting on top of a pizza pan'. How many words contain the letter 'l' in the sentence.
Example Output:
1