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

Example Input: Sentence: 'a large brown dog with a white deflated ball in its mouth'. How many words contain the letter 'm' in the sentence.
Example Output: 1

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 group of people in colorful outfits walking together on the street'. How many words contain the letter 'z' in the sentence.
Example Output:
0