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

[EX Q]: Sentence: 'a person that is wearing glasses looking into a mirror'. How many words contain the letter 'f' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a clock tower next to a building in a city'. How many words contain the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a picture of some toilets outside of a building'. How many words contain the letter 'l' in the sentence.
[EX A]:
2