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

Example Input: Sentence: 'a mother zebra standing next to a baby zebra'. How many words contain the letter 'e' in the sentence.
Example Output: 4

Example Input: Sentence: 'a grey cat sitting in a metal kitchen sink next to cans of soda'. How many words contain the letter 't' in the sentence.
Example Output: 6

Example Input: Sentence: 'a tennis player getting ready to hit the ball'. How many words contain the letter 'r' in the sentence.
Example Output:
2