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 grey cat starring at a hand with a donut'. How many words start with the letter 'a' in the sentence.
[A]: 4


[Q]: Sentence: 'the pigeons are walking around in the park around the benches'. How many words start with the letter 'b' in the sentence.
[A]: 1


[Q]: Sentence: 'a group of people loading up on a big airplane'. How many words start with the letter 'o' in the sentence.
[A]:
2