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

Example Input: Sentence: 'Two people riding a surfboard in the open waves'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'a man is flying through the air on a snowboard'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'A young boy with an umbrella and backpack'. Count the number of verbs in this sentence.
Example Output:
0