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

[EX Q]: Sentence: 'a line of portable toilets stands outdoors under trees'. How many words contain the letter 'l' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a laptop computer that is sitting on a desk'. How many words contain the letter 't' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a parrot sitting on a branch looking down'. How many words contain the letter 'o' in the sentence.
[EX A]:
4