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

Example Input: Sentence: 'a skier skiing on the mountain with trees behind him'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'a young girl is brushing her teeth  in a bathroom'. How many words contain the letter 'f' in the sentence.
Example Output: 0

Example Input: Sentence: 'a jet airliner carrying a small shuttle above it'. How many words contain the letter 'r' in the sentence.
Example Output:
2