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

[EX Q]: Sentence: 'bus parked next to a side walk on the road'. How many words contain the letter 'd' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a kitchen with a dining room table and a sitting area'. How many words contain the letter 'r' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a baseball mitt with a baseball sitting inside of it'. How many words contain the letter 's' in the sentence.
[EX A]:
4