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

Example Input: Sentence: 'a stir fry consisting of rice broccoli and other vegetables'. How many words contain the letter 'e' in the sentence.
Example Output: 3

Example Input: Sentence: 'there is a small bowl of soup and vegetables'. How many words contain the letter 'g' in the sentence.
Example Output: 1

Example Input: Sentence: 'an image of a train that is going down the tracks'. How many words contain the letter 'n' in the sentence.
Example Output:
4