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

[Q]: Sentence: 'a couple of zebras are standing in a pin'. How many words contain the letter 'a' in the sentence.
[A]: 5

[Q]: Sentence: 'a very big nice looking kitchen that is well lit'. How many words contain the letter 'r' in the sentence.
[A]: 1

[Q]: Sentence: 'three zebra standing next to each other on a grass covered field'. How many words contain the letter 'n' in the sentence.
[A]:
3