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 skateboarding down a rail next to a building'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

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

[EX Q]: Sentence: 'one man throws a frisbe to another man at a park'. How many words start with the letter 'a' in the sentence.
[EX A]:
4