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 train riding through tracks in a large train station'. How many words end with the letter 'n' in the sentence.
Example Output: 4

Example Input: Sentence: 'a boy is riding a skateboard off of a ramp'. How many words end with the letter 's' in the sentence.
Example Output: 1

Example Input: Sentence: 'boy lying prone on a surf board as he rides a wave in'. How many words end with the letter 'n' in the sentence.
Example Output:
2