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 (", ").

Ex Input:
Paragraph- Sent 1: Energy is the ability to do work.
Sent 2: Another way to say this is, the ability to cause change.
Sent 3: Work is done when a force is used to move something.
Sent 4: When work is done, energy is transferred.
Sent 5: This transfer occurs between one object and another.
Sent 6: For example, a batter swings a bat and transfers energy.
Sent 7: She transfers her energy to the bat.
Sent 8: The moving bat, in turn, transfers energy to the ball.
Sent 9: Energy is measured in the Joule (J).
Sent 10: Energy exists in many forms.
Sent 11: One form of energy is called mechanical.
Sent 12: Mechanical energy is the energy of motion.
Sent 13: This type of energy can also include things that are not yet in motion.
Sent 14: In these cases, they have only a potential to be in motion.
Sent 15: In most cases, this ability comes from a position.
Sent 16: A rock sitting on top of a cliff has potential energy.
Sent 17: It is more than just the ability.
Sent 18: A rock sitting on the ground could move if someone picked it up.
Question: What kind of energy is mechanical energy?.

Ex Output:
11, 12.

Ex Input:
Paragraph- Sent 1: Suddenly, Amy screamed.
Sent 2: I whirled around and threw up my arm just in time to knock Dvorov away.
Sent 3: His eyes were glowing red, and he had bared a set of fangs that could probably take my hand off.
Sent 4: The dancers near us tried to clear some space.
Sent 5: He shot back up, hardly touching the ground, and I kicked him back.
Sent 6: He jumped at my arm while I was still off-balance, and I felt the surge of adrenaline that comes right when your body realizes that it's too late to save itself.
Sent 7: A heavy thing hit my arm with a thump and knocked me back against someone with rough paws who held me up.
Sent 8: On the floor was Dvorov's head, separated from his body by several feet and a growing puddle of dark blood.
Sent 9: Nepthys stood over him with a blue sword in his hand.
Sent 10: It flashed in the strobe where it wasn't streaked with Dvorov's blood.
Sent 11: "He wasn't the only one with a secret or two," he said by way of explanation.
Sent 12: "You spotted our boy, didn't you?
Sent 13: I bet his hide-out is nearby, too.
Sent 14: Let's hurry." He wiped off the sword and sheathed it in a scabbard now belted to his hip.
Sent 15: The crowd parted for us.
Sent 16: The vampire glanced up when he saw the crowd split and his eyes flashed when he noticed us.
Sent 17: In a blink of the strobe light, he was on his feet and dashing from the room.
Sent 18: "Come on!" shouted Nepthys.
Sent 19: We chased after him, Amy keeping up valiantly behind us.
Sent 20: He bashed up a set of stairs set into the side of the wall, and we chased up after him, heading up a huge staircase that seemed to go up for more stories than the building could have held.
Question: Who dashed from the room in the blink of a strobe light?.

Ex Output:
16, 17.

Ex Input:
Paragraph- Sent 1: In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.
Sent 2: He apprehended that his equations predicted the universe to be either contracting or expanding.
Sent 3: He wanted the universe to be eternal and unchanging, but this type of universe is not consistent with relativity.
Sent 4: To fix this, Einstein modified the general theory by introducing a new notion, the cosmological constant, which he called ''Lambda''.
Sent 5: The purpose of Lambda was to rectify the effects of gravity and allow the whole system to stay balanced.
Sent 6: With a positive cosmological constant, the universe could be an eternal static sphere.
Sent 7: However, in 1929, Edwin Hubble confirmed that the universe is expanding, Einstein exclaimed after his Mount Wilson visit with Hubble: "If there is no quasi-static world, then away with the cosmological term!"Sent 8: and Einstein supposedly discarded the cosmological constant.
Sent 9: Einstein believed a spherical static universe is philosophically preferred, because it would obey Mach's principle.
Sent 10: He had shown that general relativity incorporates Mach's principle to a certain extent in frame dragging by gravitomagnetic fields, but he knew that Mach's idea would not work if space goes on forever.
Sent 11: In a closed universe, he believed that Mach's principle would hold.
Sent 12: Mach's principle has generated much controversy over the years.
Sent 13: In many of Einstein biographies, writers claim that he called the creation of Lambda his "biggest blunder".
Sent 14: Recently, astrophysicist Mario Livio showed that Einstein possibly never said that.
Sent 15: Instead of discarding Lambda, Einstein was continually experimenting with it.
Sent 16: In late 2013, Irish physicist Cormac O'Raifeartaigh, happened to discover a handwritten manuscript by Einstein which was since then overlooked by other scientists.
Sent 17: The research paper was titled ''"Zum kosmologischen Problem"'' ("About the Cosmological Problem").
Sent 18: And Einstein proposed a revision of his model, still with a cosmological constant, but now the constant was responsible for the creation of new matter as the universe expanded.
Question: The discovery of an expanding universe by what scientist caused Einstein to discard his cosmological constant?.

Ex Output:
7, 8.