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

Example Input: Sentence: 'a counter topped with vases in front of a window'. How many words start with the letter 'w' in the sentence.
Example Output: 2

Example Input: Sentence: 'a large jet liner sitting on top of an airport runway'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'five people on skis standing on the snow together'. How many words start with the letter 't' in the sentence.
Example Output:
2