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

Input: Consider Input: Sentence: 'a stop light that is out on a pole'. How many words contain the letter 'z' in the sentence.

Output: 0

Input: Consider Input: Sentence: 'a sign asking for witnesses is posted in front of a destroyed home'. How many words contain the letter 'y' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a swan swimming next to a snowcovered rocky shore'. How many words contain the letter 'o' in the sentence.
Output: 4