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

Example Input: Sentence: 'a black sign that is standing in the grass'. How many words contain the letter 'f' in the sentence.
Example Output: 0

Example Input: Sentence: 'a smiling  woman wearing a hat holds up a snowboard'. How many words contain the letter 'b' in the sentence.
Example Output: 1

Example Input: Sentence: 'a couple of zebras and antelopes captured on a wildlife camera'. How many words contain the letter 'm' in the sentence.
Example Output:
1