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

Example Input: Sentence: 'a group of people standing together talking '. How many words contain the letter 'b' in the sentence.
Example Output: 0

Example Input: Sentence: 'man and woman posing for picture before prom'. How many words contain the letter 'c' in the sentence.
Example Output: 1

Example Input: Sentence: 'a child that is sitting next to a teddy bear'. How many words contain the letter 'a' in the sentence.
Example Output:
4