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.

[Q]: Sentence: 'a woman sitting on some stairs by a ball and backpack'. How many words start with the letter 'b' in the sentence.
[A]: 3


[Q]: Sentence: 'a red passenger train traveling passed a large tourist building'. How many words start with the letter 't' in the sentence.
[A]: 3


[Q]: Sentence: 'ostrich in enclosed area next to a giraffe'. How many words start with the letter 't' in the sentence.
[A]:
1