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: 'several people are playing frisbee in a park'. How many words start with the letter 'a' in the sentence.
2

Sentence: 'a laptop and some computers on a desk'. How many words start with the letter 'd' in the sentence.
1

Sentence: 'a giraffe up close to people watching it at a zoo'. How many words start with the letter 'a' in the sentence.

3