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: Dr. Alex Cross is a psychiatrist and police lieutenant who lives in Detroit with his wife , Maria , their children , Damon and Janelle , and his grandmother , Nana Mama .
Sent 2: Upon learning that Maria is pregnant with their third child , Cross considers accepting a job as an FBI profiler , but fears Maria 's reaction , as it 'd require them to relocate to Washington , D.C. Meanwhile , a man called Picasso attends to an illegal underground Mixed Martial Arts fighting ring , where he flirts with businesswoman Fan Yau .
Sent 3: After brutally beating his opponent , Picasso is invited to Fan Yau 's house , where he sedates her while they 're having sex , tortures and kills her .
Sent 4: Police Captain Richard Brookwell calls Cross and his partner , Tommy Kane , to the crime scene .
Sent 5: On the way there , Cross tells Kane about Maria 's pregnancy and the the FBI 's offer , and Kane reveals that he is secretly dating their colleague , Monica Ashe .
Sent 6: Cross deduces that Picasso is a professional assassin , and finds a sketch made behind by Picasso , revealing that his next target is businessman Erich Nunemarcher .
Sent 7: Cross , Kane and Ashe go to Nunemarcher 's office , but Nunemarcher ignores their claims .
Sent 8: Picasso manages to enter the building , but is prevented from killing Nunemarcher by Cross , and escapes after being shot by Kane .
Sent 9: Cross analyzes a drop of Picasso 's blood and learns that he is a psychotic former member of the Special Forces and that his real target is billionaire CEO Leon Mercier .
Sent 10: Cross informs Mercier that Picasso might be trying to kill him .
Question: Who does Cross talk with during this story?.

Ex Output:
5, 7, 9.

Ex Input:
Paragraph- Sent 1: A group of researchers at a remote jungle island outpost discover the natives are practicing voodoo and black magic .
Sent 2: After killing the local priest , a voodoo curse begins to raise the dead to feed on the living in retribution .
Sent 3: The researchers on the island are killed by the newly risen zombies , except for Jenny , the daughter of a scientist couple .
Sent 4: She escapes , protected by an enchanted necklace charm given to her by her mother shortly before her death .
Sent 5: She returns years later as an adult with a group of mercenaries to attempt to uncover what happened to her parents .
Sent 6: Shortly after arriving at the island their boat 's engine dies , stranding them .
Sent 7: Meanwhile elsewhere on the island a trio of hikers discover a cave , the same cave leading to the underground temple where the original curse was created .
Sent 8: After accidentally reviving the curse , the dead once again return to kill any who trespass on their island .
Sent 9: The mercenaries encounter their first zombie , who injures a member of the team .
Sent 10: Taking shelter in the remains of the old research facilities medical quarters they are soon joined by Chuck , the only surviving hiker .
Sent 11: Arming themselves with weapons left behind by the long dead research team , they make their stand as the dead once again rise .
Sent 12: One by one they are injured or killed , one of whom sacrifices himself to blow up the medical facility and his newly undead team members .
Sent 13: Jenny and Chuck flee , the only survivors remaining .
Sent 14: They stumble upon the cave once again , where the zombies appear and attack .
Question: What are the dead called who feed on the living in retribution?.

Ex Output:
2, 3.

Ex Input:
Paragraph- Sent 1: What if two children push a swing at the same time?
Sent 2: Would the swing go higher?
Sent 3: Yes, together their force would be more.
Sent 4: It is common for forces to be combined.
Sent 5: Most objects on Earth have at least two forces acting on them.
Sent 6: Do you know what one of them is?
Sent 7: Of course, that force is gravity.
Sent 8: How many forces do you have on you right now?
Sent 9: Gravity pulls you down toward the center of Earth.
Sent 10: Your legs exert a downward force.
Sent 11: They hold you up against the pull of gravity.
Sent 12: Consider the example in Figure 1.3.
Sent 13: A book is resting on a table.
Sent 14: Gravity pulls the book downward.
Sent 15: It has a force of 20 newtons.
Sent 16: At the same time, the table pushes the book upward.
Sent 17: Its force is also 20 newtons.
Sent 18: The table opposes the pull of gravity.
Question: What pulls you down?.

Ex Output:
7, 9.