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

Example Input: Sentence: 'there are trains that are on the train track'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'a man srufing the waves on a board in front of 3 tall pillars'. How many words contain the letter 'n' in the sentence.
Example Output: 5

Example Input: Sentence: 'a police car with its door open sits behind another car'. How many words contain the letter 'h' in the sentence.
Example Output:
3