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: 'two skiers standing side by side in the snow posing for a picture'. How many words contain the letter 'u' in the sentence.
Example Output: 1

Example Input: Sentence: 'a child is petting a goat at a petting zoo'. How many words contain the letter 'g' in the sentence.
Example Output:
3