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

Example Input: Sentence: 'Many bicyclists wearing helmets race down the street'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'A woman is sitting in the grass next to her red bike'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A man playing  a game of tennis hitting a ball'. Count the number of verbs in this sentence.
Example Output:
2