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

[Q]: Sentence: 'a man in a helmet leans on his motorcycle'. How many words contain the letter 'n' in the sentence.
[A]: 4


[Q]: Sentence: 'a stop sign casting a shadow of a sign that says war'. How many words contain the letter 'y' in the sentence.
[A]: 1


[Q]: Sentence: 'a person sitting underneath an overpass in the sun'. How many words contain the letter 'e' in the sentence.
[A]:
4