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

[Q]: Sentence: 'a van follows behind a bus on a rural road'. How many words contain the letter 'q' in the sentence.
[A]: 0


[Q]: Sentence: 'a group of many horses going about in a grassy meadow'. How many words contain the letter 'f' in the sentence.
[A]: 1


[Q]: Sentence: 'a grey cat sleeping in chair under a desk'. How many words contain the letter 'a' in the sentence.
[A]:
4