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 photograph of a vase through its glass showcase'. How many words start with the letter 'i' in the sentence.
1

Sentence: 'a person on a court with a tennis racket'. How many words start with the letter 'p' in the sentence.
1

Sentence: 'outside a dog is leaping in the air to catch a frisbee'. How many words start with the letter 'a' in the sentence.

3