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 black and white photo of a large clock on a building'. How many words contain the letter 't' in the sentence.
Example Output: 2

Example Input: Sentence: 'an old gold and black clock on a stone tower'. How many words contain the letter 'u' in the sentence.
Example Output:
0