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

Sentence: 'a persons desk with a computer and many books in a case behind it'. How many words contain the letter 'd' in the sentence.
3

Sentence: 'a sleek and pointy fighter jet flying in the sky'. How many words contain the letter 'f' in the sentence.
2

Sentence: 'a couple of trains are parked next to each other'. How many words contain the letter 'n' in the sentence.

2