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

[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

[EX Q]: Sentence: 'many people are playing a sports video game while standing up'. How many words contain the letter 'l' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a big boat that is parked at the dock'. How many words contain the letter 's' in the sentence.
[EX A]:
1