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

Example Input: Sentence: 'a couple of cut outs of plants berries and apples'. How many words contain the letter 'd' in the sentence.
Example Output: 1

Example Input: Sentence: 'horses standing and laying down in the grass on a hill above a lake'. How many words contain the letter 'g' in the sentence.
Example Output: 3

Example Input: Sentence: 'two small black bears being held by a volunteer at an animal shelter'. How many words contain the letter 'b' in the sentence.
Example Output:
4