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 is standing by a pier near a fire hydrant'. How many words start with the letter 'p' in the sentence.
2

Sentence: 'a train passes over a quiet city park on a bridge'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a surfer is flying off his board on a sunny day'. How many words start with the letter 's' in the sentence.

2