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

Example Input: Sentence: 'a long tower on top of a white building'. Count the number of verbs in this sentence.
Example Output: 0

Example Input: Sentence: 'A man riding skis across snow covered ground'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'A picture of the side of a semi showing chefs'. Count the number of verbs in this sentence.
Example Output:
1