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 tall giraffe kissing the bark of a brown tree'. How many words start with the letter 'a' in the sentence.
[A]: 2


[Q]: Sentence: 'a boy is in bed reading a magazine'. How many words start with the letter 'i' in the sentence.
[A]: 2


[Q]: Sentence: 'a cat standing on the keyboard of an open laptop'. How many words start with the letter 'o' in the sentence.
[A]:
3