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

Example Input: Sentence: 'several people and a dog riding on a small boat'. How many words contain the letter 'l' in the sentence.
Example Output: 3

Example Input: Sentence: 'a young man in a bunch of waves on his board'. How many words contain the letter 'j' in the sentence.
Example Output: 0

Example Input: Sentence: 'a dog is catching a frisbee mid air above the grass'. How many words contain the letter 'f' in the sentence.
Example Output:
1