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

[EX Q]: Sentence: 'an old airplane sitting on top of a field'. How many words contain the letter 'h' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'ther e is a commuter train that is coming on the tracks'. How many words contain the letter 'r' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a boy sits in a chair with his pizza'. How many words contain the letter 'b' in the sentence.
[EX A]:
1