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: 'unusual round vase with flower stems inside it'. How many words contain the letter 'c' in the sentence.
Example Output: 0

Example Input: Sentence: 'oranges and a leaf are in a silver colander'. How many words contain the letter 'b' in the sentence.
Example Output:
0