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: 'the side of a chartered bus painted with a red horse'. How many words end with the letter 'a' in the sentence.
Example Output: 2

Example Input: Sentence: 'a bike stands on his dirtbike in a circus'. How many words end with the letter 'n' in the sentence.
Example Output: 2

Example Input: Sentence: 'a snowboarder jumping in the air in front of trees'. How many words end with the letter 'r' in the sentence.
Example Output:
2