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 colorful sculpture of an elephant in a park'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a woman standing next to a surfboard at the ocean'. How many words start with the letter 't' in the sentence.
Example Output: 2

Example Input: Sentence: 'bananas and an orange on a yellow background'. How many words start with the letter 'a' in the sentence.
Example Output:
3