In this task, you need to count the number of nouns/verbs in the given sentence.

Example input: Sentence: 'A small toy kept on tray held by a man'. Count the number of nouns in this sentence.
Example output: 3
Example explanation: The words 'toy', 'tray', and 'man' are nouns in this sentence. So, the answer is 3.
Q: Sentence: 'A taco salad with a side of salsa and sour cream are sitting on a white plate'. Count the number of nouns in this sentence.
A:
6