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 man using a laptop computer on a table'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a tennis player swings his racket on a serve'. How many words start with the letter 'o' in the sentence.
1

Sentence: 'two birds are flying side by side in a cloudy sky'. How many words start with the letter 's' in the sentence.

3