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 lit clock mounted on the side of a red building at night'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'some black birds sitting on some rocks and some water'. How many words start with the letter 'b' in the sentence.
[A]: 2


[Q]: Sentence: 'a group of men are standing in kitchen talking and cooking'. How many words start with the letter 'a' in the sentence.
[A]:
3