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

Example Input: Sentence: 'a couple of birds that are sitting next to each other'. Count the number of nouns in this sentence.
Example Output: 2

Example Input: Sentence: 'A boat with emergency lights on it sitting in a harbor'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A woman holds a horse by its bridle'. Count the number of nouns in this sentence.
Example Output:
3