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:
The winner of this year's Nobel Prize in economics says  he 's "nervous" about stocks.
"We seem to be living in the riskiest moment of our lives  and yet the stock market seems to be napping  " Richard Thaler  who won the prize for his contributions to behavioral economics   told Bloomberg TV on Tuesday. "I admit to not understanding it."
"I donât know about you  but Iâm nervous  and it seems like when investors are nervous  theyâre prone to being spooked "  he  said  adding that "nothing seems to spook the market."
 Thaler  was awarded the 2017 Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel on Monday.

Ex Output:
Richard Thaler


Ex Input:
But that 's exactly what dozens of veterans who participated in former President George W. Bush 's annual Warrior 100K this past weekend say it does for them . 
For years , Bush has invited wounded servicemen and women to his Crawford ranch for camaraderie and motivation , some of them using specially designed bikes to accommodate missing limbs . 
And reports are that Bush was no slacker on the latest ride .

Ex Output:
George W Bush


Ex Input:
SEOUL  South Korea (AP)  â North Korean leader Kim Jong Un  said Monday that the United States should be aware that  his  country's nuclear forces are now a reality  not a threat. But  he  also struck a conciliatory tone in  his  New Year's address  wishing success for the Winter Olympics set to begin in South Korea in February and suggesting the North may send a delegation to participate.
 Kim   wearing a Western-style gray suit and tie  said in  his  customary annual address that  his  country had achieved the historic feat of "completing" its nuclear forces and added that  he  has a nuclear button on  his  desk.
"The U.S. should know that the button for nuclear weapons is on my table "  he  said during the speech  as translated by The Associated Press.
"The entire area of the U.S. mainland is within our nuclear strike range. ... The United States can never start a war against me and our country  " Kim  said.
In this photo provided by the North Korean government  North Korean leader Kim Jong Un delivers his New Year's speech at an undisclosed place in North Korea Monday  Jan. 1  2018.  Kim  said Monday the United States should be aware that  his  country's nuclear forces are now a reality  not a threat. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified. Korean language watermark on image as provided by source reads: "KCNA" which is the abbreviation for Korean Central News Agency. (Korean Central News Agency/Korea News Service via AP)
South Koreans watch a TV news program showing  North Korean leader Kim Jong Un 's New Year's speech  at the Seoul Railway Station in Seoul  South Korea  Monday  Jan. 1  2018. The letters read on top left  " Kim Jong Un  delivers New Year's speech."  Kim  said Monday the United States should be aware that  his  country's nuclear forces are now a reality  not a threat. But  he  also struck a conciliatory tone in  his  New Year's address  wishing success for the Winter Olympics set to begin in the South in February and suggesting the North may send a delegation to participate. (AP Photo/Lee Jin-man)
The New Year's address is an annual event in North Korea and is watched closely for indications of the direction and priorities  Kim  may adopt in the year ahead.
Visitors walk by a TV screen showing a TV news program reporting about  North Korean leader Kim Jong Un 's New Year's speech  at the Seoul Railway Station in Seoul  South Korea  Monday  Jan. 1  2018. The letters read on top left  " Kim Jong Un  delivers New Year's speech."  Kim  said the United States should be aware that  his  country's nuclear forces are now a reality  not a threat. (AP Photo/Lee Jin-man)
 Kim  also stressed North Korea's economic achievements during the speech  and noted the importance of improving the nation's standard of living.

Ex Output:

Kim Jong Un