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

[EX Q]: Sentence: 'a train on the side of a road on the edge of the water'. How many words contain the letter 'u' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a toilet sits in the middle of a street'. How many words contain the letter 'b' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a meat sandwich is resting beside a mound of spinach and red lettuce leaves'. How many words contain the letter 'n' in the sentence.
[EX A]:
5