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

Example Input: Sentence: 'a group of people playing soccer on a field of grass'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A moose is standing out by a river'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A piece of chocolate cake on top of a white plate'. Count the number of verbs in this sentence.
Example Output:
0