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: 'a man buttering toast in his kitchen on the counter'. How many words contain the letter 'c' in the sentence.
Example Output: 2

Example Input: Sentence: 'a group of people gathered around a table of food'. How many words contain the letter 'u' in the sentence.
Example Output:
2