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

[EX Q]: Sentence: 'people walking down the sidewalk with no turn signs'. How many words contain the letter 'e' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a man holding a tennis racquet on a tennis court'. How many words contain the letter 'w' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a young child looks on at a birthday cake'. How many words contain the letter 'y' in the sentence.
[EX A]:
2