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

Example Input: Sentence: 'a couple sitting on seats on a train'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'looking out a window at a tall building with a clock on the face'. How many words contain the letter 'l' in the sentence.
Example Output: 4

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