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 dog on one side of a glass door and a cat on the other side'. How many words start with the letter 'a' in the sentence.
4

Sentence: 'a close up of three older men standing near one another'. How many words start with the letter 'a' in the sentence.
2

Sentence: 'a flock of sheep grazing in the hilly area'. How many words start with the letter 'a' in the sentence.

2