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

Example Input: Sentence: 'a girl at a lake is looking at sand inside of a frisbee'. How many words contain the letter 'u' in the sentence.
Example Output: 0

Example Input: Sentence: 'a cat lying on an open laptop that is on a bed'. How many words contain the letter 'y' in the sentence.
Example Output: 1

Example Input: Sentence: 'a subway train is parked on the train tracks'. How many words contain the letter 'c' in the sentence.
Example Output:
1