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 man who is holding some food near his mouth'. How many words start with the letter 'f' in the sentence.
[EX A]: 1

[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

[EX Q]: Sentence: 'a woman walking up to a double decker bus that has stopped'. How many words start with the letter 'w' in the sentence.
[EX A]:
2