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

Ex Input:
Sentence: 'There's a toilet in a bathroom with a mirror behind it'. Count the number of verbs in this sentence.

Ex Output:
0


Ex Input:
Sentence: 'A military airplane is sitting on the runway'. Count the number of verbs in this sentence.

Ex Output:
1


Ex Input:
Sentence: 'A boy with a backpack walks to the front of the bus'. Count the number of verbs in this sentence.

Ex Output:

1