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 man in red and black jacket snowboarding on slope'. How many words start with the letter 'o' in the sentence.
[A]: 1


[Q]: Sentence: 'there is a bird standing on a rocky shore'. How many words start with the letter 'a' in the sentence.
[A]: 2


[Q]: Sentence: 'nature scene with running stream and forest in background'. How many words start with the letter 'w' in the sentence.
[A]:
1