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 fighter jet on a runway with a cover over the cockpit'. How many words start with the letter 'a' in the sentence.
answer:
3


question:
Sentence: 'a train passes over a quiet city park on a bridge'. How many words start with the letter 'a' in the sentence.
answer:

3