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

Example Input: Sentence: 'a white plate of food including rice and vegetables with beef'. How many words contain the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'a apple that is sitting on top of a knife'. How many words contain the letter 'u' in the sentence.
Example Output: 0

Example Input: Sentence: 'several people in a lunch line with hot dogs and buns'. How many words contain the letter 'l' in the sentence.
Example Output:
4