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

Example Input: Sentence: 'a fresh flower on a table in a piture of water'. How many words contain the letter 'n' in the sentence.
Example Output: 2

Example Input: Sentence: 'bus moving through parking lot in front of building'. How many words contain the letter 'g' in the sentence.
Example Output: 4

Example Input: Sentence: 'a person riding a bicycle under an umbrella on the sidewalk in front of a store'. How many words contain the letter 'y' in the sentence.
Example Output:
1