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: A flood occurs when a river overflows its banks.
Sent 2: This might happen because of heavy rains.
Sent 3: Floodplains In very flat regions, flood water may spread out on the surface of the land.
Sent 4: It then slows down and drops its sediment.
Sent 5: If a river floods often, a floodplain develops.
Sent 6: A floodplain is an area where a thick layer of rich soil is left behind as the floodwater recedes.
Sent 7: Thats why floodplains are usually good places for growing plants.
Sent 8: They are very flat areas and they have very rich soils.
Sent 9: The Nile River valley is a great example of a floodplain.
Sent 10: Each year, the Nile River rises over its banks.
Sent 11: This floodwater carries a lot of sediment.
Sent 12: This sediment has been eroded off areas of land from upstream.
Sent 13: This sediment is dropped as the water slows down after spreading across the land.
Sent 14: What is left behind is a very rich soil.
Sent 15: Thats why crops can be raised in the middle of a sandy desert.
Sent 16: Natural Levees A flooding river often forms natural levees along its banks.
Sent 17: A levee is a raised strip of sediments deposited close to the waters edge.
Question: What valley contains a river which rises over its banks each year?.

Ex Output:
9, 10.

Ex Input:
Paragraph- Sent 1: The Ottoman Empire was weakening, however, and in 1821, the peoples of the Greek mainland achieved nationhood for the first time.
Sent 2: The Cyclades and the Sporades island chains were also included in this new state.
Sent 3: A new sense of identity enveloped Greek peoples throughout the Aegean, thus commencing a movement to expand Greece and unify the disparate Orthodox populations.
Sent 4: The Twentieth Century A series of disastrous decisions at the beginning of the 20th century began to sound a death knell for the Ottoman Empire.
Sent 5: The Turks lost a short war with Italy, and were forced to relinquish the Dodecanese islands to the Italians.
Sent 6: Greece took this opportunity to absorb the islands of the northern and eastern Aegean and to add Macedonia to its mainland territories.
Sent 7: Following this debacle, the Ottomans then allied themselves to Germany in the World War I, losing more territory with the defeat of the Germans in that war.
Sent 8: Greece was handed a strip of land along the western coast of Asia Minor, which for over 2,000 years had had a substantial Greek population.
Sent 9: Greece moved in to administer the land, but a new influence upset any grand dreams of making this region a part of greater Greece.
Sent 10: In 1923, Turkey broke away from the tired Ottoman rulers, and Kemal Ataturk rose to power on a wave of popular support.
Sent 11: He promised a modern state for his people, but as the situation became volatile, civil strife broke out in Turkish cities, and those considered Greek were victims of threats and violence.
Sent 12: Many had to leave their birthplaces, fleeing to Lesvos, Chios, and Samos, the Greek-ruled islands just offshore.
Sent 13: Thousands of people arrived with little more than the clothes they wore, putting great strain on the resources of the islands.
Sent 14: Finally, Greece was ousted from its new territory in Asia Minor, which became part of the new Turkish state.
Question: When did Greece absorb the islands of the northern and eastern Aegean?.

Ex Output:
5, 6.

Ex Input:
Paragraph- Sent 1: Plants also detect the daily cycle of light and darkness.
Sent 2: Do you know how plants respond to these changes?
Sent 3: Some plants open their leaves during the day.
Sent 4: It is during these hours the plant can collect sunlight.
Sent 5: At night, the plant closes its leaves to prevent water loss.
Sent 6: Many plants respond to the change in the length of the day.
Sent 7: As days grow shorter, some plants respond by going dormant.
Sent 8: Dormant is when a plant suspends its growth.
Sent 9: It does this in order to survive.
Sent 10: Shorter days signal the coming of winter.
Sent 11: Winter in most areas means extreme cold.
Sent 12: It is also very dry in the winter months.
Sent 13: As winter approaches, some plants respond by their leaves changing color.
Sent 14: After the change in color, they fall off.
Sent 15: This dormancy period helps trees.
Sent 16: It allows them to survive the cold and dry winter.
Sent 17: Plants only want to grow when conditions are right.
Question: Does a plant suspend its growth when days get longer, or when days get shorter?.

Ex Output:
7, 8.