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 young kid in a hat with a parrot on his shoulder'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'an older airplane flies over the country side'. How many words start with the letter 'o' in the sentence.
2

Sentence: 'a dog sleeping on top of a bed in a bedroom'. How many words start with the letter 'b' in the sentence.

2