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

Sentence: 'a man and a woman sitting in the backseat as the woman talks on a cell phone'. How many words contain the letter 's' in the sentence.
4

Sentence: 'a man with a skateboard up in air at a skateboard park'. How many words contain the letter 's' in the sentence.
2

Sentence: 'a bunch of cows are walking down the street'. How many words contain the letter 'l' in the sentence.

1