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

Example Input: Sentence: 'a couple is fast asleep at 3 in the morning'. How many words contain the letter 'y' in the sentence.
Example Output: 0

Example Input: Sentence: 'a man in a helmet leans on his motorcycle'. How many words contain the letter 'n' in the sentence.
Example Output: 4

Example Input: Sentence: 'a two door black oven built into a cabinet'. How many words contain the letter 'n' in the sentence.
Example Output:
3