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 that is playing a wii in a living room'. How many words start with the letter 'i' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a bird sitting on the neck of a giraffe'. How many words start with the letter 'o' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a group of people walking down a street with a brown truck'. How many words start with the letter 'b' in the sentence.
[EX A]:
1