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

Example Input: Sentence: 'a person in uniform is on a motorcycle near other uniformed people'. How many words contain the letter 'r' in the sentence.
Example Output: 6

Example Input: Sentence: 'a group of people skiing down a mountain slope'. How many words contain the letter 'e' in the sentence.
Example Output: 2

Example Input: Sentence: 'two cats stand beside a pink door and potted plants'. How many words contain the letter 'z' in the sentence.
Example Output:
0