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 girl and her dog walk past a bike'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'an electric train stands on the train tracks'. How many words start with the letter 't' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a group of cute stuffed animals in a bed'. How many words start with the letter 'i' in the sentence.
[EX A]:
1