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

Example Input: Sentence: 'a wooden bench sits leveled straight on a slanted ground'. How many words contain the letter 'l' in the sentence.
Example Output: 2

Example Input: Sentence: 'the tennis player returns a serve of the tennis ball'. How many words contain the letter 'q' in the sentence.
Example Output: 0

Example Input: Sentence: 'the baby elephant is walking with a small object in its trunk'. How many words contain the letter 's' in the sentence.
Example Output:
3