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: 'five giraffes meandering along in their outdoor habitat'. How many words start with the letter 'f' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a blue brick building with a man leaning on it'. How many words start with the letter 'b' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'three friends sit and talk while waiting for the train'. How many words start with the letter 'a' in the sentence.
[EX A]:
1