Definition: You are given a paragraph, with numbered sentences, and a question. Write the numbers of the sentences needed to answer the given question. Separate multiple sentence numbers with a comma (", "). E.g. "1, 2" would be the correct response if Sent 1 and Sent 2 are needed to answer the given question (do not include sentences that contain no information that is necessary to answer the question). Sort the sentence numbers in an increasing order (i.e., '1, 2', instead of '2, 1'). Your answer should not contain anything than the sentence numbers separated by a comma (e.g. '1, 2, 3, 4'). The given question requires more than one sentence to answer. So, your answer must contain at least one comma (", ").
Input: Paragraph- Sent 1: Johnny and his class were looking forward to a fun day in art class.
Sent 2: The teacher gave the class paint, brushes and other items to use to make their drawings.
Sent 3: Johnny's friend Kevin used a straw to blow paint on his paper.
Sent 4: It looked very cool.
Sent 5: Lisa used markers to make a picture of her and her dog.
Sent 6: Lisa has several pets, but her favorite one is her dog, Ben.
Sent 7: Tony used a potato to make stars.
Sent 8: He then put the potato into different colors of paint and made a nice pattern.
Sent 9: Johnny used feathers to make his picture.
Sent 10: When they had finished, the class chose which picture was the best.
Sent 11: Johnny got second place and was very excited.
Sent 12: Then it was time for lunch and the class had a party.
Sent 13: They had hamburgers with ketchup and had cake for dessert.
Sent 14: It was a very fun day for the whole class.
Sent 15: They all went home tired and happy.
Sent 16: Johnny took a nap when he went home. 
Question: What items did Johnny and his classmates use in art class as art mediums?.
Output:
2, 3, 5, 7, 9.