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

Example Input: Sentence: 'a woman standing in the dirt looking up at an elephant'. How many words contain the letter 'b' in the sentence.
Example Output: 0

Example Input: Sentence: 'a pair of tennis players on a tennis court'. How many words contain the letter 'u' in the sentence.
Example Output: 1

Example Input: Sentence: 'children play in the water coming from the fire hydrant'. How many words contain the letter 'e' in the sentence.
Example Output:
5