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 refrigerator a white cabinet a microwave and some blue walls'. How many words start with the letter 'b' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a sink toilet and trashcan in a bathroom'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a young boy in blue is standing in the snow'. How many words start with the letter 'a' in the sentence.
[EX A]:
1