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

[Q]: Sentence: 'a pile of stuffed brown teddy bears wearing clothing'. How many words contain the letter 'w' in the sentence.
[A]: 2


[Q]: Sentence: 'the tennis player returns a serve of the tennis ball'. How many words contain the letter 'q' in the sentence.
[A]: 0


[Q]: Sentence: 'a group of children sit on a bench outside'. How many words contain the letter 'n' in the sentence.
[A]:
3