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

[EX Q]: Sentence: 'a black sign that is standing in the grass'. How many words contain the letter 'f' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a blue traffic sign next to a parked car on a city street'. How many words contain the letter 'g' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a person holding a white cup with a kitten inside of it'. How many words contain the letter 'n' in the sentence.
[EX A]:
4