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

Ex Input:
Sentence: 'The players are playing a game of Frisbee on the grass'. Count the number of verbs in this sentence.

Ex Output:
1

Ex Input:
Sentence: 'A man flying a kite at the beach while several people walk by'. Count the number of verbs in this sentence.

Ex Output:
2

Ex Input:
Sentence: 'A bathroom with a toilet and a counter next to a door'. Count the number of verbs in this sentence.

Ex Output:
0