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 computer monitor and other computer accessories are nicely organized on a desk'. How many words start with the letter 'o' in the sentence.
Example Output: 3

Example Input: Sentence: 'a boy in an orange jacket holds a blue and white tennis racket'. How many words start with the letter 'w' in the sentence.
Example Output: 1

Example Input: Sentence: 'a woman has a glass of wine next to a barrel'. How many words start with the letter 'h' in the sentence.
Example Output:
1