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

Input: Consider Input: Sentence: 'several people and a dog riding on a small boat'. How many words contain the letter 'l' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'a laptop a table a mouse some dirt and water'. How many words contain the letter 'u' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a bathroom mirror sitting above a counter near a doorway'. How many words contain the letter 'u' in the sentence.
Output: 1