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: 'an image of a man with a tennis racket in hand'. How many words contain the letter 'u' in the sentence.
Example Output: 0

Example Input: Sentence: 'two street signs a stop and all way sign and some houses and trees'. How many words contain the letter 'c' in the sentence.
Example Output:
0