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

Example Input: Sentence: 'street signs are affixed to a utility pole'. How many words contain the letter 'u' in the sentence.
Example Output: 1

Example Input: Sentence: 'a clean kitchen with several cabinets a sink a coffee maker and a vase of flowers'. How many words contain the letter 'p' in the sentence.
Example Output: 0

Example Input: Sentence: 'a group of people fishing next to a railroad bridge'. How many words contain the letter 'l' in the sentence.
Example Output:
2