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

[EX Q]: Sentence: 'this bus waits at a bus station for passengers to board'. How many words contain the letter 'e' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a boy tucks his knees to complete a jump on his skate board'. How many words contain the letter 'f' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'an elephant that is eating some leaves from a tree'. How many words contain the letter 'n' in the sentence.
[EX A]:
3