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

Example Input: Sentence: 'a picture of some horses and a person in the street'. How many words contain the letter 'r' in the sentence.
Example Output: 4

Example Input: Sentence: 'a pizza sitting on top of a black cutting board'. How many words contain the letter 'g' in the sentence.
Example Output: 2

Example Input: Sentence: 'a woman wearing a purple dress and a big hat on a cellphone'. How many words contain the letter 't' in the sentence.
Example Output:
1