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

Example Input: Sentence: 'a tennis player holds a ball as if to throw it in the air to serve it'. How many words contain the letter 'o' in the sentence.
Example Output: 4

Example Input: Sentence: 'someone is holding an orange and black iphone'. How many words contain the letter 'h' in the sentence.
Example Output: 2

Example Input: Sentence: 'a person is watching tv in the living room'. How many words contain the letter 'n' in the sentence.
Example Output:
4