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

Input: Consider Input: Sentence: 'a cat that is laying down with a mouse on top of it'. How many words contain the letter 'm' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'ancient pottery being displayed on an exhibit case'. How many words contain the letter 's' in the sentence.

Output: 2

Input: Consider Input: Sentence: 'two clocks are hanging in a doctors office'. How many words contain the letter 'c' in the sentence.
Output: 3