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

Example Input: Sentence: 'a woman in a wheelchair is about to play tennis'. How many words contain the letter 'r' in the sentence.
Example Output: 1

Example Input: Sentence: 'a name and clock lit up at night'. How many words contain the letter 'y' in the sentence.
Example Output: 0

Example Input: Sentence: 'railroad tracks with tanker car and boxcar and smokestacks'. How many words contain the letter 'd' in the sentence.
Example Output:
3