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

[EX Q]: Sentence: 'a very cute white dog standing by a table with food'. How many words contain the letter 'o' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a long train is coming down some tracks'. How many words contain the letter 'w' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'several kids on skateboards at a skating park'. How many words contain the letter 'k' in the sentence.
[EX A]:
4