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

Example Input: Sentence: 'Three children are sitting with food in the park'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'A group of people march across a field with a red flag'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A bear is walking around a very dense, green area'. Count the number of verbs in this sentence.
Example Output:
1