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

Example Input: Sentence: 'A man riding on the back of an elephant near a lake'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'toilet in small space with blue and white tile'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'A living room with two couches, a fireplace and a tv'. Count the number of nouns in this sentence.
Example Output:
5