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

Example Input: Sentence: 'The three giraffes are being kept indoors for being to see'. Count the number of verbs in this sentence.
Example Output: 3

Example Input: Sentence: 'Street signs with a cartoon policeman in Shanghai'. Count the number of verbs in this sentence.
Example Output: 0

Example Input: Sentence: 'a red train and a wall with graffiti on it'. Count the number of verbs in this sentence.
Example Output:
0