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

[EX Q]: 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.
[EX A]: 3

[EX Q]: Sentence: 'a cat that is laying down with a mouse on top of it'. How many words contain the letter 'm' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a yellow train going down the train track'. How many words contain the letter 'x' in the sentence.
[EX A]:
0