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

Example Input: Sentence: 'A group of elephants gathered around their watering hole'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'Three slices of thin pizza next to two bottles of wine'. Count the number of verbs in this sentence.
Example Output: 0

Example Input: Sentence: 'A large airplane sits on a wet airstrip on the other side of barred windows'. Count the number of verbs in this sentence.
Example Output:
2