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

[EX Q]: Sentence: 'watchful raptor standing on one foot on a rock pile'. How many words contain the letter 'r' in the sentence.
[EX A]: 2

[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 train pulling into the station as passengers wait'. How many words contain the letter 'd' in the sentence.
[EX A]:
0