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 bus stops in order to pick up passengers'. How many words start with the letter 'p' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a closeup picture of a polar bears head'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a woman on skis posing for a picture'. How many words start with the letter 'w' in the sentence.
[EX A]:
1