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 bus is parked on the side of a road in front of a building'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a person on skis goes across a snowy slope'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a bed with pillows and a brown blanket is sitting against a stone wall'. How many words start with the letter 'i' in the sentence.

1