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

[EX Q]: Sentence: 'a girl at a lake is looking at sand inside of a frisbee'. How many words contain the letter 'u' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'some girls on a soccer field playing soccer'. How many words contain the letter 'j' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a black and white cat sitting on a park bench'. How many words contain the letter 'n' in the sentence.
[EX A]:
4