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.

[EX Q]: Sentence: 'an older airplane flying above buildings and fields'. How many words start with the letter 'a' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a blue and white sign attached to a building'. How many words start with the letter 'a' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'several piles of yellow bananas vertically affixed to bamboo poles'. How many words start with the letter 'a' in the sentence.
[EX A]:
1