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 person on a snowboard on a snowy day'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a man pitching a baseball from a mound to a home plate'. How many words start with the letter 'a' in the sentence.
4

Sentence: 'on a bright day a young elephant in partial shade near a tree'. How many words start with the letter 'o' in the sentence.

1