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

Example Input: Sentence: 'a living room with couches chairs and tables'. How many words contain the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'a pair of people swimming out to sea on some surfboards'. How many words contain the letter 'j' in the sentence.
Example Output: 0

Example Input: Sentence: 'a box filled with fresh fruit and vegetables'. How many words contain the letter 'w' in the sentence.
Example Output:
1

