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].

Example Input: The home-made submarine "UC3 Nautilus"  built by Danish inventor Peter Madsen  who is charged with killing Swedish journalist Kim Wall in his submarine  sails in the harbour of Copenhagen  Denmark  August 10  2017. REUTERS/Peter Thompson
 Wall  a freelance journalist who was researching a story on submarine owner Peter Madsen   went missing after  he  took  her  out to sea in the 17-metre (56-foot) submarine in August.
On Aug. 23  police identified a headless female torso that washed ashore in Copenhagen as that of Wall. In October  police said they had recovered  her  head and legs.
 Madsen  admitted to dismembering Wall on board  his  submarine and dumping  her  body parts in the sea  but  he  still denies murdering  her  and a charge of sexual assault without intercourse.
Example Output: Peter Madsen

Example Input: FILE - This is a Thursday  Aug. 31  2017. file photo of European Commission President Jean-Claude Juncker  left  as he welcomes  former British Prime Minister Tony Blair  prior to a meeting at EU headquarters in Brussels.  Blair  on Thursday Jan. 4  2018 was pressing  his  view that voters should be given a chance to re-think Brexit once plans for Britainâs departure from the European Union are clear. (Virginia Mayo  File/Associated Press)
LONDON â  Former British Prime Minister Tony Blair  is pressing  his  long-held view that voters should be given a chance to re-think Brexit once plans for Britainâs departure from the European Union are clear.
 Blair  said Thursday that the Labour Party  he  led for 13 years should be actively challenging Brexit rather than going along with plans laid out by Prime Minister Theresa May and her Conservative Party allies.
 Blair  and other opponents argue that voters should be able to review these terms and decide whether to go ahead rather than be bound by the 2016 referendum  which saw Britons back Brexit by a four-point margin.
âIâm simply saying one very  very simple thing  which is that in 2016 you knew you wanted to get out of the European Union but you didnât see the terms of the alternative relationship â  Blair  told the BBC radio. âIf when you see those terms you think it is better to stick with Europe you are entitled to have that say.â
In an article on his website   Blair  said Labour should challenge May every week at prime ministerâs question time by asking why the Conservatives are âweakening our country.â That approach is only credible   he  said  if Labour is clearly opposed to Brexit.
 Blair âs political stock fell dramatically with public opposition to  his  decision to join the U.S.-led invasion of Iraq  and there are no indications that  his  opposition to Brexit is gaining traction within the party  which has moved sharply to the left since making Corbyn its leader in 2105.
Example Output: Tony Blair

Example Input: Agriculture Secretary Sonny Perdue  Was 2018's 'Designated Survivor'
President Trump's first State of the Union address had a prestigious and eclectic audience — Vice President Pence  an assortment of Cabinet secretaries  Bill Nye the Science Guy  Paul Ryan's likely 2018 Democratic opponent and a plethora of military heroes — but one member of Trump's Cabinet was notably missing: Agriculture Secretary Sonny Perdue.
 Perdue  was this year's "designated survivor " the chosen official who skips the president's speech to ensure the continuity of government in the case of a catastrophe that wipes out the president  the vice president and the rest of the nation's leaders who will be in attendance.
The White House announced just before Tuesday's speech that  Perdue  would skip the State of the Union address in the House chamber at the Capitol and instead spend the evening in a secure and undisclosed location.
The selection of  Perdue  to lead the hypothetically decimated government is an arguably bipartisan one. The former governor of Georgia was one of Trump's Cabinet selections who didn't cause a stir  as he was confirmed by the Senate last April by a vote of 87-11  with dozens of Democrats voting for him.
 Perdue  grew up on a farm in central Georgia and worked as a veterinarian before serving as the state's governor from 2003 to 2011.
It's unclear where exactly  he  was Tuesday during Trump's speech.
Example Output:
Sonny Perdue