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 horse pulling a carriage with people in the snow'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a zeppelin flying in the air as a water spouts occurs in a city lake'. How many words start with the letter 'a' in the sentence.
[EX A]: 5

[EX Q]: Sentence: 'two young girls posing for a picture while riding a bus'. How many words start with the letter 'w' in the sentence.
[EX A]:
1