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

Example Input: Sentence: 'a large brown dog with a white deflated ball in its mouth'. How many words contain the letter 'm' in the sentence.
Example Output: 1

Example Input: Sentence: 'a lit street light next to a bar'. How many words contain the letter 'w' in the sentence.
Example Output: 0

Example Input: Sentence: 'a woman is sitting down and looking at something on her cell phone'. How many words contain the letter 'f' in the sentence.
Example Output:
0