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

Example Input: Sentence: 'a smiling man holds out a card with color swatches'. How many words contain the letter 'i' in the sentence.
Example Output: 2

Example Input: Sentence: 'a sign asking for witnesses is posted in front of a destroyed home'. How many words contain the letter 'y' in the sentence.
Example Output: 1

Example Input: Sentence: 'a woman in a green jacket prepares to eat a plate of food'. How many words contain the letter 'i' in the sentence.
Example Output:
1