Given the task definition and input, reply with output. In this task, you need to count the number of nouns/verbs in the given sentence.

Sentence: 'A woman preparing to serve a ball thrown high in the air'. Count the number of nouns in this sentence.

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
3