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

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: 'bus parked next to a side walk on the road'. How many words contain the letter 'd' in the sentence.
Example Output: 3

Example Input: Sentence: 'the big ben clock tower towering over the city of london'. How many words contain the letter 's' in the sentence.
Example Output:
0