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 little boy learning to throw a frisbee'. How many words contain the letter 'h' in the sentence.
Example Output: 1

Example Input: Sentence: 'the zebra stands and looks down at the ground'. How many words contain the letter 'm' in the sentence.
Example Output:
0