instruction:
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.
question:
Sentence: 'a person taking a slice of pizza from a pie'. How many words start with the letter 'p' in the sentence.
answer:
3


question:
Sentence: 'a man touching a bird on top of a cage'. How many words start with the letter 'a' in the sentence.
answer:
3


question:
Sentence: 'two people with a motorcycle and trailer parked by a waterfall'. How many words start with the letter 'a' in the sentence.
answer:

3