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.

Sentence: 'a man on a surfboard in the midst of an ocean wave'. How many words start with the letter 'o' in the sentence.
3

Sentence: 'a black bear walks in front of a tree in a forest'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a woman riding a horse alongside the beach'. How many words start with the letter 'a' in the sentence.

3