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

Example Input: Sentence: 'there is a person awaiting to cross this street'. How many words contain the letter 'a' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man skiing through a snowcovered street area'. How many words contain the letter 'p' in the sentence.
Example Output: 0

Example Input: Sentence: 'food steaming machine on the shelf of a store'. How many words contain the letter 'o' in the sentence.
Example Output:
4