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

Ex Input:
Sentence: 'A cardboard sign is stapled onto a tree on a street'. Count the number of verbs in this sentence.

Ex Output:
1

Ex Input:
Sentence: 'The jar that is left out on the table is dirty'. Count the number of verbs in this sentence.

Ex Output:
1

Ex Input:
Sentence: 'Two birds walking alone a wooden rail at a park'. Count the number of verbs in this sentence.

Ex Output:
1