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.

[Q]: Sentence: 'a young kid in a hat with a parrot on his shoulder'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a mother bear and her two young are crossing a shallow river'. How many words start with the letter 'a' in the sentence.
[A]: 4


[Q]: Sentence: 'a large brown cow standing on top of a grass field'. How many words start with the letter 'a' in the sentence.
[A]:
2