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 riding their mountain bike off road'. How many words start with the letter 'r' in the sentence.
[A]: 2


[Q]: Sentence: 'a close up view of a mans hands as he operates a smart phone'. How many words start with the letter 'c' in the sentence.
[A]: 1


[Q]: Sentence: 'a scene of a river with a bridge in the distance'. How many words start with the letter 'o' in the sentence.
[A]:
1