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: 'A laptop cake sits on a wooden table by a window'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A group of people walking down a small road under a large white tree'. Count the number of nouns in this sentence.
Example Output:
4