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: 'two elephants with people riding on them next to block barriers'. How many words start with the letter 'o' in the sentence.
Example Output: 1

Example Input: Sentence: 'decorative objects on a counter in front of a framed picture'. How many words start with the letter 'o' in the sentence.
Example Output: 3

Example Input: Sentence: 'a very neat looking kitchen with a small stove'. How many words start with the letter 'a' in the sentence.
Example Output:
2