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

Example Input: Sentence: 'a plate with a grilled sanwich next to a bowl of tomato soup'. How many words contain the letter 'a' in the sentence.
Example Output: 6

Example Input: Sentence: 'there is a red tea pot that has flowers in it'. How many words contain the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man that is sitting down with a cat'. How many words contain the letter 'y' in the sentence.
Example Output:
0