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

Example Input: Sentence: 'A person is lying on the luggage claim conveyor belt'. Count the number of verbs in this sentence.
Example Output: 1

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: 'Two young people on ski mountain looking unenthused about the sport'. Count the number of verbs in this sentence.
Example Output:
1