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

[Q]: Sentence: 'four white and blue street signs on a wooden pole'. How many words contain the letter 'u' in the sentence.
[A]: 2


[Q]: Sentence: 'ancient pottery being displayed on an exhibit case'. How many words contain the letter 's' in the sentence.
[A]: 2


[Q]: Sentence: 'postal carrier waiting on sidewalk while bus passes'. How many words contain the letter 'w' in the sentence.
[A]:
3