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

Example Input: Sentence: 'a mother and son holding wii controls in front of a christmas fireplace'. How many words contain the letter 'x' in the sentence.
Example Output: 0

Example Input: Sentence: 'a wooden bench sits leveled straight on a slanted ground'. How many words contain the letter 'l' in the sentence.
Example Output: 2

Example Input: Sentence: 'skier on a hill overlooking a pine forest'. How many words contain the letter 'd' in the sentence.
Example Output:
0