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

Example Input: Sentence: 'a man with a white surfboard riding a small wave'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'Two Astros fans use their cell phones in the stands'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'Two zebras standing near rocks behind a fence'. Count the number of verbs in this sentence.
Example Output:
1