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

[EX Q]: Sentence: 'two men are dancing in a parade with brown umbrellas'. How many words contain the letter 'r' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a red car parked with a gas pump inserted into it'. How many words contain the letter 'l' in the sentence.
[EX A]: 0

[EX Q]: Sentence: 'two children are in the bathroom brushing their teeth'. How many words contain the letter 'n' in the sentence.
[EX A]:
3