Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].

Ex Input:
SEOUL (Reuters) - Kim Jong Un on Monday warned the United States he has a ânuclear buttonâ on his desk ready for use if North Korea is threatened  but offered an olive branch to South Korea  saying he was âopen to dialogueâ with Seoul.
After a year dominated by fiery rhetoric and escalating tensions over North Koreaâs nuclear weapons program   Kim  used  his  televised New Yearâs Day speech to declare North Korea âa peace-loving and responsible nuclear powerâ and call for lower military tensions and improved ties with the South.
âWhen it comes to North-South relations  we should lower the military tensions on the Korean Peninsula to create a peaceful environment â  Kim  said. âBoth the North and the South should make efforts.â
 Kim  said  he  would consider sending a delegation to the Winter Olympics Games to be held in Pyeongchang  South Korea  in February.
âNorth Koreaâs participation in the Winter Games will be a good opportunity to showcase the national pride and we wish the Games will be a success. Officials from the two Koreas may urgently meet to discuss the possibility â  Kim  said.
South Korea said it welcomed  Kimâs  offer to send a delegation to the Pyeongchang Games and hold talks with the South to discuss possible participation.
U.S.-based experts saw  Kim âs speech as a clear attempt to divide South Korea from its main ally  the United States  which has led an international campaign to pressure North Korea to give up weapons programs aimed at developing nuclear missiles capable of hitting the United States.
Asked by reporters to comment on  Kim âs speech  U.S. President Donald Trump simply said  âweâll see  weâll seeâ  as  he  walked into New Yearâs Eve celebration at Mar-a-Lago   his  elite resort in Florida.
Revere said  Kim Jong Un âs speech contained the strongest defense of North Koreaâs status as a permanently nuclear-armed country he had seen.
FILE PHOTO:  North Korean leader Kim Jong Un  waves to people attending a military parade marking the 105th birth anniversary of country's founding father   Kim Il  Sung in Pyongyang  April 15  2017. REUTERS/Damir Sagolj
â Implicit in Kim Jong Unâs speech  is a willingness to engage with others  including the United States  on the basis of their acceptance of the ârealityâ of North Koreaâs permanent nuclear status. Thatâs not a basis on which the United States is prepared to engage â  he  said.
Rather than encouraging U.S. measures that âthreaten the security and peace of the Korean peninsula â Seoul should instead respond to overtures from the North  and âstop nuclear war exercises with foreign forces â  Kim  said.
After North Korea tested its most powerful intercontinental ballistic missile (ICBM) in November  which it said was capable of delivering a warhead to anywhere in the United States   Kim  declared  his  nuclear force complete.
 He  continued that theme in  his  New Yearâs address  announcing that North Korea would focus in the coming year on âmass producing nuclear warheads and ballistic missiles for operational deploymentâ.
This   Kim  said  was âirreversible with any forceâ  making it impossible for the United States to start a war against North Korea.
âThe whole territory of the U.S. is within the range of our nuclear strike and a nuclear button is always on the desk of my office and this is just a reality  not a threat â  he  said  while emphasizing that the weapons would only be used if North Korea is threatened.

Ex Output:
Kim Jong Un


Ex Input:
Tom Crean  was seated in the back of the cafeteria with classic rock playing from the speakers as  he  huddled with  his  notes and film on  his  laptop to prepare for Tuesday nightâs game between Oklahoma and Kansas.
 Crean   the former Marquette and Indiana head coach  is out of coaching for the first time since  he  entered the profession  but  he  is as attached to the game as ever.  Crean  said  he  is learning a fresh perspective as an ESPN analyst  and  he  has received credit for offering keen insight during games.
 Crean  was fired in March 2017 after  his  ninth season at Indiana  which ended with an 18-16 record.  His  Hoosiers teams made three Sweet 16 appearances in the NCAA tournament but couldnât advance further.
Now   Crean  spends  his  time at  his  home in Florida  where  his  son Riley â a 35th-round draft pick of the White Sox â is playing at IMG Academy and will be eligible for the baseball draft again in June.  Crean  had time to help  his  older daughter move to California and rarely misses  his  younger daughterâs volleyball games.  He  runs into fellow Florida resident Dick Vitale  who âpumps me up.â
And of course  Crean  is still on the road  soaking in college basketball from the media side.
 His  former Hoosiers team  now coached by Archie Miller  plays at Illinois on Wednesday.
Hereâs what  Crean  told the Tribune in a phone interview about a year of transitions and when  he  would like to get back to coaching:

Ex Output:
Tom Crean


Ex Input:
"Science created the ability to destroy ourselves and the planet several times in a matter of hours " said Castro in an editorial published by local media. "The greatest contradiction in our age is the ability of our species to destroy itself and its inability to govern itself at the same time."
 In the editorial entitled "The madness of our time." Castro listed the catastrophic effects of global warming and pointed to threats posed by new weapons and military technologies of the United States.
 He criticized the United States for developing new high-tech military devices such as the recent launch of an unmanned "space plane" by U.S.air force from Cape Canaveral.
 These moves "reveal the true philosophy of the United States " said Castro. He also described the role of U.S. President Barack Obama at the Climate Change Summit in Copenhagen as "disappointing" and a "painful deception" to the public.
Castro. He also described the role of U.S. President Barack Obama at the Climate Change Summit in Copenhagen as "disappointing" and a "painful deception" to the public.
 Castro said global warming will lead to the rise of sea levels  the decrease of drinkable water and arable land. It will also result in the pollution of oceans and extinction of many species in a few decades.
 Castro noted that genetic manipulation and chemical fertilizers helped meet people's basic needs for food  and he questioned if they can produce  healthy food fit for consumption. He also stressed the need for protecting non-renewable vital minerals and energy.
 Castro  83  handed over power to his brother Raul Castro for health reasons in June 2006. Since then he has devoted to work on what he called his "reflections" on issues of global importance through editorials.

Ex Output:

Fidel Castro