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 small airplane sitting on top of a runway'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a young man holding a tennis racquet and its case'. How many words start with the letter 'h' in the sentence.
1

Sentence: 'a young man dressed in business attire standing on a city street'. How many words start with the letter 'b' in the sentence.

1