Given the task definition, example input & output, solve the new input case.
In this task, you need to count the number of nouns/verbs in the given sentence.
Example: Sentence: 'A small toy kept on tray held by a man'. Count the number of nouns in this sentence.
Output: 3
The words 'toy', 'tray', and 'man' are nouns in this sentence. So, the answer is 3.

New input case for you: Sentence: 'A bear is walking around a very dense, green area'. Count the number of nouns in this sentence.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
2