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

Input: Consider Input: Sentence: 'a bird is standing on the edge of a book'. How many words contain the letter 'o' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'a man on a motorcycle towing another man on a skateboard'. How many words contain the letter 'n' in the sentence.

Output: 6

Input: Consider Input: Sentence: 'a man in denim jacket and glasses talking on a cellphone'. How many words contain the letter 'h' in the sentence.
Output: 1