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.

[EX Q]: Sentence: 'a group of people that are by and elephant'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a person taking a slice of pizza from a pie'. How many words start with the letter 'p' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'an old structure made of stone and red brick'. How many words start with the letter 'a' in the sentence.
[EX A]:
2