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 photograph of a man using a cell phone on the street'. How many words contain the letter 'r' in the sentence.
Example Output: 2

Example Input: Sentence: 'people walking down the sidewalk with no turn signs'. How many words contain the letter 'e' in the sentence.
Example Output: 3

Example Input: Sentence: 'crates of fruit and vegetables are on display'. How many words contain the letter 'a' in the sentence.
Example Output:
5