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

Example Input: Sentence: 'a large pizza smothered in cheese and sauce'. How many words contain the letter 'a' in the sentence.
Example Output: 5

Example Input: Sentence: 'a grown elephant with two baby elephants standing in tall grasses'. How many words contain the letter 'w' in the sentence.
Example Output: 3

Example Input: Sentence: 'a sink and a toilet in front of a shower curtain'. How many words contain the letter 'l' in the sentence.
Example Output:
1