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

[EX Q]: Sentence: 'a white cat looking in a rectangular mirror in a female bedroom'. How many words contain the letter 'q' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a toilet sits in the middle of a street'. How many words contain the letter 'b' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a horse with a saddle standing by some hay'. How many words contain the letter 'n' in the sentence.
[EX A]:
1