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

Example Input: Sentence: 'A man and a woman walking towards a food vendor that is across the street'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'a man is squatting down to fix a kite'. Count the number of nouns in this sentence.
Example Output: 2

Example Input: Sentence: 'a young man flipping over on his skateboard in a skate park'. Count the number of verbs in this sentence.
Example Output:
1