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

Example Input: Sentence: 'a long train is coming down some tracks'. How many words contain the letter 'w' in the sentence.
Example Output: 1

Example Input: Sentence: 'a horse that has a car behind it in the street'. How many words contain the letter 'j' in the sentence.
Example Output: 0

Example Input: Sentence: 'man holding kite ready for take off on sunny day'. How many words contain the letter 'a' in the sentence.
Example Output:
4