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

Example Input: Sentence: 'a man is riding a red motorcycle on the street'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'A man riding a skateboard on a walkway surrounded by people'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'A zebra sticks his head into a car window and checks out a passenger'. Count the number of verbs in this sentence.
Example Output:
2