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 woman sitting on some stairs by a ball and backpack'. How many words start with the letter 'b' in the sentence.
3

Sentence: 'a silver blue and red jet is flying over a fence'. How many words start with the letter 'f' in the sentence.
2

Sentence: 'a man leaping into the air and swinging a tennis racket'. How many words start with the letter 'l' in the sentence.

1