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

Sentence: 'a sandwich shop with cars parked in front of it'. How many words contain the letter 'u' in the sentence.
0

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

Sentence: 'a train that is sitting on the tracks near gravel'. How many words contain the letter 's' in the sentence.
3