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

[EX Q]: Sentence: 'a couple of people that are on some skateboards'. How many words contain the letter 'o' in the sentence.
[EX A]: 6

[EX Q]: Sentence: 'there are trains that are on the train track'. How many words contain the letter 'z' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'two men are riding horses around an arena'. How many words contain the letter 'r' in the sentence.
[EX A]:
5