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

Input: Consider Input: Sentence: 'An adult polar bear with two baby bears following on the snow'. Count the number of verbs in this sentence.

Output: 1

Input: Consider Input: Sentence: 'A clock on a red building letting people know the time'. Count the number of verbs in this sentence.

Output: 2

Input: Consider Input: Sentence: 'A zebra standing in grass in its enclosure'. Count the number of verbs in this sentence.
Output: 1