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 black and white photo of a man in the street feeding cats and dogs'. How many words start with the letter 'a' in the sentence.

Answer: 4


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 male in a wet suit surfing on a black and white board'. How many words start with the letter 'a' in the sentence.

Answer:
4