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 clock tower is standing next to palm trees'. How many words start with the letter 't' in the sentence.
Example Output: 3

Example Input: Sentence: 'a white kitchen has green and lime accents'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a portrait depicts a vase a glass of water and a coffee cup'. How many words start with the letter 'a' in the sentence.
Example Output:
5