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

Example Input: Sentence: 'a man in mid swing of a baseball bat'. How many words contain the letter 'k' 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 baseball player covered in dirt runs to a base'. How many words contain the letter 'o' in the sentence.
Example Output:
2