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

Example Input: Sentence: 'black and white photo of old man riding a motorcycle'. How many words contain the letter 'n' in the sentence.
Example Output: 3

Example Input: Sentence: 'a woman is hitting a tennis ball with her racket'. How many words contain the letter 'c' in the sentence.
Example Output: 1

Example Input: Sentence: 'a seagull standing in front of a garbage can and a wall'. How many words contain the letter 'i' in the sentence.
Example Output:
2