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: 'street signs for the intersection of library way and fifth avenue'. How many words start with the letter 'o' in the sentence.
1

Sentence: 'a small bathroom has a mirror vanity and toilet'. How many words start with the letter 'b' in the sentence.
1

Sentence: 'two pictures of a dog sitting next to a chair'. How many words start with the letter 'n' in the sentence.

1