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 airplane as it is taking off and is ascending into space'. How many words start with the letter 'a' in the sentence.
answer:
5

question:
Sentence: 'a puppy sits on top of a computer chair'. How many words start with the letter 'c' in the sentence.
answer:
2

question:
Sentence: 'black and white photograph of people walking on a sidewalk'. How many words start with the letter 'b' in the sentence.
answer:
1