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.

[EX Q]: Sentence: 'two pizzas sitting on top of a pan on a counter'. How many words start with the letter 'p' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'montage color photograph of helmeted motorcycle riders and a rural fire station'. How many words start with the letter 'r' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a small black bird hiding in the grass'. How many words start with the letter 'b' in the sentence.
[EX A]:
2