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: 'some signs and the roof of a train station'. How many words start with the letter 'a' in the sentence.
2

Sentence: 'a mother bear and her two young are crossing a shallow river'. How many words start with the letter 'a' in the sentence.
4

Sentence: 'basket full of fresh fruits and vegetables next to a black cat'. How many words start with the letter 'c' in the sentence.

1