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

Example Input: Sentence: 'A man flying through the air while riding skis'. Count the number of nouns in this sentence.
Example Output: 3

Example Input: Sentence: 'A woman holding a tennis racquet on a tennis court'. Count the number of nouns in this sentence.
Example Output: 5

Example Input: Sentence: 'Two people walk down an city sidewalk carrying umbrellas'. Count the number of verbs in this sentence.
Example Output:
2