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:
Former President George W. Bush has been widely praised for yesterday 's speech at the Dallas police memorial and especially for a quote which has been widely shared on social media . 
Many people on Twitter found themselves almost shocked that they were so impressed by Mr Bush . 
Michael Beckman , who described himself as a ` Jewish conservative Republican ' tweeted : ` President George W. Bush gave a beautiful speech today . 
Many people searched the internet to see if Mr Bush had plagiarized it from another source . 
Former President George W Bush speaks at Dallas memorial . 
Houston radio host Matt Patrick tweeted today : ` Loved George W. Bush 's speech yesterday ! 
Time magazine published Bush 's entire speech but it was that particular passage which was seen by many Americans as a touchstone for their feelings . 
Twitter user Jacob Boos claimed Bush 's speech was better than Obama 's and added : ` Then again probably not he has an agenda to push . ' 
But most thought that whoever had written his speech deserved great credit , as did Bush himself , for delivering it with warmth and sincerity . 
Mr Bush said : ` These slain officers were "the best among us" .

Ex Output:
George W Bush


Ex Input:
But maybe â just maybe â this one game  this one Saturday afternoon at Madison Square Garden  is a hint that thereâs life yet in the old bear  in the St. Johnâs basketball team  which had no business sharing a court with the fourth-ranked Duke Blue Devils yet somehow walked off that court with an 81-77 victory.
âIâm happy for the guys â  St. Johnâs coach Chris Mullin  said. âThey needed it more than anything.â
It is what this program needed  too  as much as anything. As the losses mounted  the helplessness did too. Nobody expected  Mullin âs return to  his  Utopia Parkway kingdom to be a magic elixir  but nobody figured on 0-11 in the Big East in Year 3  either. It has been hard for  Mullin âs guys  yes  but it has been just as hard for the faithful to keep their faith.
âThe month of January was rough for us â forward Tariq Owens said. âBut  Coach  never stopped preaching to us and we never left the gym and finally it paid off.â
Itâs one game  yes. Two years ago   St. Johnâs  hammered a Syracuse team bound for the Final Four and  it  proved merely an outlier. Maybe this will be the same thing.
Or maybe it wonât be. If you care about St. Johnâs  and about college basketball in this city  it really is the only way to root.

Ex Output:
St. John


Ex Input:
TAIPEI (Reuters) - Nvidia Corp chief executive Jensen Huang said on Thursday artificial intelligence would enable fully automated cars within 4 years  but sought to tamp down expectations for a surge in demand for its chips from cryptocurrency miners.
FILE PHOTO: Nvidia co-founder and CEO Jensen Huang attends an event during the annual Computex computer exhibition in Taipei  Taiwan May 30  2017. REUTERS/Tyrone Siu
âIt will take no more than 4 years to have fully autonomous cars on the road. How long it takes for the vast majority of cars on the road to become that  it really just depends â  Huang  told media after a company event in Taipei.
But  Huang  joined peers taming expectations of strong revenue growth from a wave of interest in cryptocurrencies. Advanced Micro Devices Inc expected this week that there will be some leveling off of cryptocurrency demand. [nL4N1MZ5RP]
âRevenue for us in crypto is over $100 million a quarter. For us  itâs a small percentage... Itâs obviously not a target market â  Huang  said.

Ex Output:

Jensen Huang