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

Example Input: Sentence: 'A young teenager in glasses smiles while brushing her teeth'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A collection of headshots dot the picture frame'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A guy on a horse on a busy city street'. Count the number of verbs in this sentence.
Example Output:
0