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 doing a trick in the water'. How many words start with the letter 'i' in the sentence.
1

Sentence: 'a man holding a white frisbee while standing on top of a  beach'. How many words start with the letter 'o' in the sentence.
2

Sentence: 'two people are lying in a bed with a computer'. How many words start with the letter 'a' in the sentence.

3