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

Example Input: Sentence: 'A large white polar bear eating a carrot'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A man and children are riding on the back of an elephant'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A clock tower in between two leafless trees'. Count the number of verbs in this sentence.
Example Output:
0