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

[EX Q]: Sentence: 'four white and blue street signs on a wooden pole'. How many words contain the letter 'u' in the sentence.
[EX A]: 2

[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 monk walking down the street while holding an umbrella'. How many words contain the letter 'j' in the sentence.
[EX A]:
0