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

[Q]: Sentence: 'a little girl sitting on the floor reading a book'. How many words contain the letter 'n' in the sentence.
[A]: 3


[Q]: Sentence: 'a man with a surfboard walking across a bridge towards the ocean'. How many words contain the letter 'w' in the sentence.
[A]: 3


[Q]: Sentence: 'a man on a motorcycle towing another man on a skateboard'. How many words contain the letter 'n' in the sentence.
[A]:
6