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

Example Input: Sentence: 'A water fountain shooting up air in front of a building'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'Three zebra are grazing on grass in an open field'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'The busy street is crowded with people near tall buildings'. Count the number of verbs in this sentence.
Example Output:
1