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: 'a man skiing through a snowcovered street area'. How many words contain the letter 'p' in the sentence.
Example Output: 0

Example Input: Sentence: 'a store with lots of colorful umbrellas on the front of it'. How many words contain the letter 'f' in the sentence.
Example Output:
4