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

[EX Q]: Sentence: 'a woman bent down on the street holding her umbrella'. How many words contain the letter 'x' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'a stop sign casting a shadow of a sign that says war'. How many words contain the letter 'y' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a street has a sign on it with people walking on it'. How many words contain the letter 'b' in the sentence.
[EX A]:
0