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

Example Input: Sentence: 'a little girl sitting on the floor reading a book'. How many words contain the letter 'n' in the sentence.
Example Output: 3

Example Input: Sentence: 'five sheep out in an open field eating straw'. How many words contain the letter 'd' in the sentence.
Example Output: 1

Example Input: Sentence: 'a large animal stands in the middle of a market street'. How many words contain the letter 'b' in the sentence.
Example Output:
0