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

Example Input: Sentence: 'A man riding skis across snow covered ground'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'A skateboarder doing a trick at a skate park'. Count the number of nouns in this sentence.
Example Output: 4

Example Input: Sentence: 'A very big lady riding a bike on the street'. Count the number of nouns in this sentence.
Example Output:
3