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

Example Input: Sentence: 'a car stopped at a red light at an intersection'. How many words contain the letter 'l' in the sentence.
Example Output: 1

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 grey and white train passing under a bridge'. How many words contain the letter 'r' in the sentence.
Example Output:
4