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: 'watchful raptor standing on one foot on a rock pile'. How many words contain the letter 'r' in the sentence.
Example Output: 2

Example Input: Sentence: 'a bunch of women celebrating a womans birthday in an office building'. How many words contain the letter 'c' in the sentence.
Example Output:
3