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 person on a snowboard on a snowy day'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'this photo shows four copies of the same fire hydrant'. How many words start with the letter 't' in the sentence.
[A]: 2


[Q]: Sentence: 'a post with three signs and a building in the backround'. How many words start with the letter 'b' in the sentence.
[A]:
2