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

Example Input: Sentence: 'a giraffe biting into a tree branch with great ferocity'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'person standing in the grass striking a baseball with a bat'. How many words contain the letter 's' in the sentence.
Example Output: 5

Example Input: Sentence: 'three zebra standing next to each other on a grass covered field'. How many words contain the letter 'n' in the sentence.
Example Output:
3