instruction:
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.
question:
Sentence: 'an officer sits on a brown horse on a city street'. How many words start with the letter 'o' in the sentence.
answer:
3


question:
Sentence: 'a baseball player prepares to swing at a pitch'. How many words start with the letter 'a' in the sentence.
answer:
3


question:
Sentence: 'a sign on a tree says not a thru street'. How many words start with the letter 's' in the sentence.
answer:

3