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

Example Input: Sentence: 'A cardboard sign is stapled onto a tree on a street'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A very old style fire truck at the station'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A tiny baby elephant playing with a rubber ball'. Count the number of nouns in this sentence.
Example Output:
4