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 (", ").

Example Input: Paragraph- Sent 1: Military Notification and Response.
Sent 2: Boston Center did not follow the protocol in seeking military assistance through the prescribed chain of command.
Sent 3: In addition to notifications within the FAA, Boston Center took the initiative, at 8:34, to contact the military through the FAA's Cape Cod facility.
Sent 4: The center also tried to contact a former alert site in Atlantic City, unaware it had been phased out.
Sent 5: At 8:37:52, Boston Center reached NEADS.
Sent 6: This was the first notification received by the military-at any level-that American 11 had been hijacked: FAA: Hi.
Sent 7: Boston Center TMU [Traffic Management Unit], we have a problem here.
Sent 8: We have a hijacked aircraft headed towards New York, and we need you guys to, we need someone to scramble some F-16s or something up there, help us out.
Sent 9: NEADS: Is this real-world or exercise?
Sent 10: FAA: No, this is not an exercise, not a test.
Sent 11: NEADS ordered to battle stations the two F-15 alert aircraft at Otis Air Force Base in Falmouth, Massachusetts, 153 miles away from New York City.
Sent 12: The air defense of America began with this call.
Sent 13: At NEADS, the report of the hijacking was relayed immediately to Battle Commander Colonel Robert Marr.
Sent 14: After ordering the Otis fighters to battle stations, Colonel Marr phoned Major General Larry Arnold, commanding general of the First Air Force and NORAD's Continental Region.
Sent 15: Marr sought authorization to scramble the Otis fighters.
Sent 16: General Arnold later recalled instructing Marr to "go ahead and scramble them, and we'll get authorities later."Sent 17: General Arnold then called NORAD headquarters to report.
Sent 18: F-15 fighters were scrambled at 8:46 from Otis Air Force Base.
Question: Why did the Boston Center seek military assistance.
Example Output: 3, 6, 8.

Example Input: Paragraph- Sent 1: Hurlburt Field, Florida (CNN) -- An Air Force CV-22 Osprey crashed Wednesday during a routine training mission north of Navarre, Florida, injuring five crew members aboard, a military official said.
Sent 2: The crash occurred about 6:45 p.m.
Sent 3: at Hurlburt Field's Eglin Range, said Amy Nicholson, chief of public affairs at the airfield.
Sent 4: The five injured crew members were taken to an area hospital, Nicholson said.
Sent 5: The extent of their injuries was not immediately known.
Sent 6: The cause of the accident is under investigation, she said.
Sent 7: The Osprey was assigned to the 1st Special Operations Wing, the Air Force said.
Sent 8: The tilt-rotor aircraft can fly like an airplane and land like a helicopter.
Sent 9: The Army began developing the Osprey in 1982, though the program was nearly scrapped in 1989 when then-Secretary of Defense Dick Cheney sought to cancel it because of ballooning costs.
Sent 10: Questions were raised about the safety of the Osprey after two crashes, including one in 1992 at a Marine Corps air base in Virginia that killed the crew.
Sent 11: In late 2000, the Marine Corps grounded the Osprey fleet after two crashes -- one in Arizona that killed four crew members and 15 passengers, and another in North Carolina that killed the crew.
Sent 12: A redesign was ordered on the Osprey, and it resumed flights in 2002.
Sent 13: The Air Force began using Ospreys in 2008 after testing the aircraft in 2006.
Sent 14: They were first deployed by the Marines in Iraq in 2007 after 18 years and $20 billion in development.
Question: After the Osprey resumed flights in 2002 how long did it take for the Air Force to begin using the aircraft?.
Example Output: 12, 13.

Example Input: Paragraph- Sent 1: Gravity is a force, but not like other forces you may know.
Sent 2: Gravity is a bit special.
Sent 3: You know that a force is a push or pull.
Sent 4: If you push a ball, it starts to roll.
Sent 5: If you lift a book, it moves upward.
Sent 6: Now, imagine you drop a ball.
Sent 7: It falls to the ground.
Sent 8: Can you see the force pulling it down?
Sent 9: That is what makes gravity really cool.
Sent 10: It is invisible.
Sent 11: Invisible means you cannot see it.
Sent 12: But wait, it has even more surprises.
Sent 13: Gravity holds planets in place around the Sun.
Sent 14: Gravity keeps the Moon from flying off into space.
Sent 15: Gravity exerts a force on objects that are not even touching.
Sent 16: In fact, gravity can act over very large distances.
Sent 17: However, the force does get weaker the farther apart the objects are.
Question: What is the range and strength of gravity?.
Example Output:
16, 17.