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 flock of birds some on the ground others are perched on a park bench'. How many words end with the letter 'k' in the sentence.
Example Output: 2

Example Input: Sentence: 'the helmeted snowboarder is jumping through the air'. How many words end with the letter 's' in the sentence.
Example Output: 1

Example Input: Sentence: 'a road sign warns there is a curve in the road'. How many words end with the letter 'n' in the sentence.
Example Output:
2