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

Example Input: Sentence: 'a man riding a snowboard down the side of a snow covered slope'. How many words contain the letter 'c' in the sentence.
Example Output: 1

Example Input: Sentence: 'a clothing line with teddy bears hung by their ears'. How many words contain the letter 'n' in the sentence.
Example Output: 3

Example Input: Sentence: 'an arrangement of cut vegetables on a cutting board'. How many words contain the letter 'b' in the sentence.
Example Output:
2