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: 'a bus and a truck are pictured driving on a street'. How many words start with the letter 'a' in the sentence.
answer:
5


question:
Sentence: 'a dog is laying down on a small couch'. How many words start with the letter 'a' in the sentence.
answer:
2


question:
Sentence: 'a woman tossing a frisbee on a sandy beach'. How many words start with the letter 'a' in the sentence.
answer:

3