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

Example Input: Sentence: 'a woman on a bike with an umbrella'. How many words contain the letter 'e' in the sentence.
Example Output: 2

Example Input: Sentence: 'a apple that is sitting on top of a knife'. How many words contain the letter 'u' in the sentence.
Example Output: 0

Example Input: Sentence: 'a woman eating off of a tin serving tray outdoors'. How many words contain the letter 'a' in the sentence.
Example Output:
5