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

Example Input: Sentence: 'a smiling  woman wearing a hat holds up a snowboard'. How many words contain the letter 'b' in the sentence.
Example Output: 1

Example Input: Sentence: 'a man sleeping on a park bench then a woman looks at another man with a newspaper over his face on another park bench'. How many words contain the letter 't' in the sentence.
Example Output: 5

Example Input: Sentence: 'a person walks in front of a clock tower near a traffic light and traffic sign'. How many words contain the letter 's' in the sentence.
Example Output:
3