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

Input: Consider Input: Sentence: 'a young pitcher throws a ball on the pitchers mound while a man in red shirt looks at him'. How many words contain the letter 'z' in the sentence.

Output: 0

Input: Consider Input: Sentence: 'two children practicing for a ski race without poles'. How many words contain the letter 'e' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'a doughnut that is ready to be consumed by a mouth'. How many words contain the letter 'n' in the sentence.
Output: 2