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

Sentence: 'a man is sitting in a cubicle with a computer'. How many words contain the letter 'a' in the sentence.
4

Sentence: 'a person that is wearing glasses looking into a mirror'. How many words contain the letter 'f' in the sentence.
0

Sentence: 'three people sitting at a table together one of them is checking their cell phone'. How many words contain the letter 'u' in the sentence.

0