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

[Q]: Sentence: 'a room with a small light in the middle with a computer'. How many words contain the letter 's' in the sentence.
[A]: 1


[Q]: Sentence: 'two giraffe a mom and baby both with their heads up'. How many words contain the letter 'w' in the sentence.
[A]: 2


[Q]: Sentence: 'people walking and cars driving on a street by stores'. How many words contain the letter 'n' in the sentence.
[A]:
4