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

Example Input: Sentence: 'An oriental musical group gathered in a field'. Count the number of nouns in this sentence.
Example Output: 2

Example Input: Sentence: 'Elephants in a national park blowing dust around'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'If photo of a male zebra mounting a female zebra'. Count the number of nouns in this sentence.
Example Output:
4