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: 'man with a thought bubble coming from his head'. How many words start with the letter 'h' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man holding a nintendo wii game controller'. How many words start with the letter 'a' in the sentence.
Example Output: 2

Example Input: Sentence: 'a thin wire laying atop a technological device'. How many words start with the letter 'd' in the sentence.
Example Output:
1