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 brown dog sitting next to a brown cat on a bed'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a bunch of people in a metropolitan area with umbrellas walking on a sidewalk next to buildings'. How many words start with the letter 'p' in the sentence.
[A]: 1


[Q]: Sentence: 'a surfer is out at sea waiting for a wave to come'. How many words start with the letter 't' in the sentence.
[A]:
1