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 often changes from one form to another.
Sent 2: For example, the drummer transfers motion to sound energy.
Sent 3: When the moving drumstick strikes the drum head, the drum starts to vibrate.
Sent 4: The motion of the vibrating drum head creates the sound you hear.
Sent 5: Any form of energy can change into any other form.
Sent 6: Frequently, one form of energy changes into two or more different forms.
Sent 7: Have you ever sat in front of a campfire?
Sent 8: What are two things you notice?
Sent 9: The fire creates light.
Sent 10: It is also warm by the fire, meaning it creates heat.
Sent 11: The energy of the fire comes from the stored energy in the wood.
Sent 12: The wood contains chemical energy.
Sent 13: As it burns, the chemical energy is changed into light and heat.
Sent 14: Not all chemical energy changes produce light and heat.
Sent 15: Our cars use gasoline as a fuel.
Sent 16: Gasoline contains chemical energy.
Sent 17: When our cars burn gasoline in their engines, it is converted into motion and heat.
Sent 18: When energy changes forms, energy is conserved.
Question: drummers transform chemical energy into what ?.

Ex Output:
2, 3.

Ex Input:
Paragraph- Sent 1: Alexander's body was laid in a gold anthropoid sarcophagus that was filled with honey, which was in turn placed in a gold casket.
Sent 2: According to Aelian, a seer called Aristander foretold that the land where Alexander was laid to rest "would be happy and unvanquishable forever".
Sent 3: Perhaps more likely, the successors may have seen possession of the body as a symbol of legitimacy, since burying the prior king was a royal prerogative.
Sent 4: While Alexander's funeral cortege was on its way to Macedon, Ptolemy seized it and took it temporarily to Memphis.
Sent 5: His successor, Ptolemy II Philadelphus, transferred the sarcophagus to Alexandria, where it remained until at least late Antiquity.
Sent 6: Ptolemy IX Lathyros, one of Ptolemy's final successors, replaced Alexander's sarcophagus with a glass one so he could convert the original to coinage.
Sent 7: The recent discovery of an enormous tomb in northern Greece, at Amphipolis, dating from the time of Alexander the Great has given rise to speculation that its original intent was to be the burial place of Alexander.
Sent 8: This would fit with the intended destination of Alexander's funeral cortege.
Sent 9: Pompey, Julius Caesar and Augustus all visited the tomb in Alexandria, where Augustus, allegedly, accidentally knocked the nose off.
Sent 10: Caligula was said to have taken Alexander's breastplate from the tomb for his own use.
Sent 11: Around AD 200, Emperor Septimius Severus closed Alexander's tomb to the public.
Sent 12: His son and successor, Caracalla, a great admirer, visited the tomb during his own reign.
Sent 13: After this, details on the fate of the tomb are hazy.
Sent 14: The so-called "Alexander Sarcophagus", discovered near Sidon and now in the Istanbul Archaeology Museum, is so named not because it was thought to have contained Alexander's remains, but because its bas-reliefs depict Alexander and his companions fighting the Persians and hunting.
Sent 15: It was originally thought to have been the sarcophagus of Abdalonymus (died 311 BC), the king of Sidon appointed by Alexander immediately following the battle of Issus in 331.
Sent 16: However, more recently, it has been suggested that it may date from earlier than Abdalonymus' death.
Question: What known alterations were made to Alexander's tomb?.

Ex Output:
10, 11.

Ex Input:
Paragraph- Sent 1: Two years later Muslim forces rallied again, retaking Silves, and the Reconquista stumbled on for another half century.
Sent 2: So many inter-religious alliances reigned, and so pervasive was the intermingling of Moors and Christians, that it was hard to tell who was on which side and for which piece of land they were fighting.
Sent 3: On top of that, the situation was further clouded by a feud between Portugal and Spain, each of them claiming sovereignty over the Algarve.
Sent 4: However, by 1249 Faro and the western Algarve were retaken under King Afonso III, completing the Reconquest.
Sent 5: The possibility of war with Spain was averted by an expeditious royal marriage, and by the end of the century a treaty with Spain drew up the boundaries of Portugal that stand today.
Sent 6: The Algarve was a region regarded separately within the new Portugal, as is evidenced by the royal title "Kingdom of Portugal and the Algarve." In those days, the notion of the Algarve as a distinct entity did make some sense: like an island, it was cut off to the south and west by the Atlantic, to the east by the Guadiana River, and to the north by the mountains.
Sent 7: The region's titular autonomy was upheld until 1910, when the monarchy itself was overthrown.
Sent 8: The Navigator In 1415, long after the Reconquista was completed, a Portuguese fleet assembled on the River Tagus in Lisbon for an assault on the Moors in their homeland.
Sent 9: Crossing the Straits of Gibraltar, the armada attacked and seized the North African city of Ceuta.
Sent 10: An illustrious member of the famous raid was the young Prince Henry, half Portuguese and half English, the son of King Joao I and his wife, Philippa of Lancaster.
Sent 11: Ceuta would be Henry's one and only military victory, though he was destined to establish Portugal as a major world power, helping to develop important world trade routes by the time of his death in 1460.
Sent 12: At the age of 21, Henry assembled a School of Navigation.
Sent 13: It was certainly not a formal institution of lectures and classes, but probably resembled an informal modern-day "think-tank." Prince Henrymade governor of the Algarve in 1418had the money, influence, enthusiasm, and vision to lead and cajole the best astronomers, cartographers, boat-designers, and seamen of the day to expand Portugal's maritime horizons.
Sent 14: The waters at the western extreme of the Algarve were all that was known to sailors.
Sent 15: Once they were beyond Cabo de Sao Vicente, they faced the unknown, with no communications and no possibility of rescue if the voyage turned out badly.
Sent 16: Yet out into the unknown they went; for the glory of God and country, and in search of personal fame and fortune.
Sent 17: Their mission was made easier by the craft Algarve shipwrights had developed, a successor to the lumbering ships of the day: the caravel.
Sent 18: It was light, fast, and very maneuverable.
Question: How old was Prince Henry when he assembled a school that resembled an informal modern-day think-tank?.

Ex Output:
12, 13.