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: (CNN) -- Three human heads and three decapitated bodies with notes aimed at high government officials were found Thursday in different parts of Guatemala's capital, national police said.
Sent 2: The notes were addressed to Interior Minister Carlos Menocal and Eddy Morales, the nation's director of prisons.
Sent 3: One of the notes said the officials must impose order in the nation's prisons or these atrocities would continue, police said.
Sent 4: The other said that impunity against lawlessness must end, according to police.
Sent 5: The heads were inside plastic bags, one of them in front of the main doors to the national Congress in Guatemala City, police said.
Sent 6: "That's obviously a first for Guatemala," said Samuel Logan, an expert on Latin American gangs and founding editor of the Southern Pulse intelligence report.
Sent 7: "That's something we've seen the Zetas (drug cartel) do in Mexico."Sent 8: Donald Gonzalez, a spokesman for the national police, attributed the slayings to the Zetas or another narcotrafficking group, the Prensa Libre newspaper reported.
Sent 9: Gonzalez did not immediately return a phone call seeking comment.
Sent 10: Logan did not discount the possibility that anti-crime vigilantes could have been responsible.
Sent 11: "It could also be death squads," he said.
Sent 12: "Off-duty police officers or other types hired by local businessmen who say, 'Go after the street gangs.'Sent 13: "There's a lot of moving parts to this story," said Logan, who recently wrote a book on the Mara Salvatrucha gang of Central America and is working on a book about the Zetas, which has emerged as Mexico's most ruthless drug cartel.
Sent 14: Logan said in an interview last year that there are two main criminal elements in Guatemala: drug cartels that deal in large-scale exportation and street gangs that sell drugs at the retail level and are involved in other crimes, such as robbery and extortion.
Sent 15: In some cases, they work together.
Sent 16: When those criminals get arrested, they continue their activities inside prison, said Fernando Carrera Castro, director of the Central American Institute for Fiscal Studies in Guatemala City.
Question: How did the Interior Minister Carlos Menocal establish a connection between the decapitations and the prison systems.

Ex Output:
2, 3.

Ex Input:
Paragraph- Sent 1: (CNN) -- Cuba will pardon more than 2,900 prisoners, the government said Friday, though U.S. subcontractor Alan Gross is not among those who will be freed.
Sent 2: The decision to release the prisoners follows "numerous requests" from their family members and religious institutions, and is a humanitarian gesture, said Cuban President Raul Castro.
Sent 3: Among those who might be freed are prisoners over the age of 60, along with those who are sick, female or young with no previous criminal record.
Sent 4: With some exceptions, prisoners convicted of spying, terrorism, murder and drug trafficking will not be released.
Sent 5: Those who will be freed have already served a "important" part of their sentences and exhibited good behavior, according to an official statement published on the state-run website Cubadebate.
Sent 6: The jailed American, Gross, will not be among those pardoned, the Cuban Interests Section in Washington said.
Sent 7: Gross was jailed in December 2009, when he was working as a subcontractor on a U.S. Agency for International Development project aimed at spreading democracy.
Sent 8: Castro has accused him of importing satellite equipment to connect dissidents to the Internet, and this year Cuba's highest court upheld the 15-year sentence imposed on Gross for committing crimes against the security of the state.
Sent 9: He has maintained his innocence and said he was trying to help connect the Jewish community to the Internet.
Sent 10: Castro, speaking to the National Assembly, said that 86 prisoners from 25 countries would be among those released in coming days.
Sent 11: He cited the upcoming visit of Pope Benedict XVI as one of the motivations behind the move, which he said showed the "generosity and strength of the revolution."Sent 12: The pope has said he plans to visit Mexico and Cuba before Easter.
Question: What kind of people are being freed?.

Ex Output:
1, 3, 4.