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

[EX Q]: Sentence: 'black and white photo of old man riding a motorcycle'. How many words contain the letter 'n' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a dog jumping up and catching a frisbee in its mouth'. How many words contain the letter 'r' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'three giraffes of different sizes and ages in a zoo'. How many words contain the letter 'z' in the sentence.
[EX A]:
2