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

Example Input: Sentence: 'a man in a helmet leans on his motorcycle'. How many words contain the letter 'n' in the sentence.
Example Output: 4

Example Input: Sentence: 'a photograph of a restroom toilet in front of tiles'. How many words contain the letter 'c' in the sentence.
Example Output: 0

Example Input: Sentence: 'a traffic light with a pedestrian crossing signal on a street corner next to balloons'. How many words contain the letter 'i' in the sentence.
Example Output:
6