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

Example Input: Sentence: 'A mp3 player sitting on top of a speaker system'. Count the number of nouns in this sentence.
Example Output: 5

Example Input: Sentence: 'An elephant is by itself standing for the picture'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A man flips his skateboard next to a building'. Count the number of verbs in this sentence.
Example Output:
1