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

Example Input: Sentence: 'A man posing for a picture with a tie and suit on'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'A train on a track in the middle of a neighborhood'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'An instructor pointing at something on top of a screen'. Count the number of nouns in this sentence.
Example Output:
3