In this task, you need to count the number of words in a sentence that end with the given letter. Answer with numbers and not words.

Example Input: Sentence: 'a person on a boat with trays of seafood while he sits under a umbrella'. How many words end with the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'two personal size pizza have greens for toppings'. How many words end with the letter 'a' in the sentence.
Example Output: 1

Example Input: Sentence: 'a train moves along the track with a mountain in the background'. How many words end with the letter 'n' in the sentence.
Example Output:
3