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 little boy that is sitting down with a phone'. How many words start with the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'a boy waves at the camera standing on a tree stump'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'an individual is capture in the stillness of the picture'. How many words start with the letter 't' in the sentence.
Example Output:
2