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 close up of a baby with a tooth brush'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a horse pulling a carriage with people in the snow'. How many words start with the letter 'a' in the sentence.
2

Sentence: 'a yellow fire hydrant is placed in the grass'. How many words start with the letter 'i' in the sentence.

2