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 man rides a black motorcycle around a curve'. How many words contain the letter 'y' in the sentence.
Example Output: 1

Example Input: Sentence: 'a laptop computer sitting on top of a white desk'. How many words contain the letter 'u' in the sentence.
Example Output:
1