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: 'child standing in front of a stop sign on a suburban street corner'. How many words contain the letter 'u' in the sentence.
Example Output: 1

Example Input: Sentence: 'two small boys are sitting and eating hotdogs'. How many words contain the letter 's' in the sentence.
Example Output:
4