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: DORTMUND  Germany (Reuters) - Cristiano Ronaldo scored twice in his 150th European appearance to give Real Madrid a 3-1 victory at Borussia Dortmund  their first against them in Germany  and make it two wins out of two matches in their Champions League Group H.
Soccer Football - Champions League - Borussia Dortmund vs Real Madrid - Westfalenstadion  Dortmund  Germany - September 26  2017 Real Madrid’s Cristiano Ronaldo celebrates scoring their second goal with Gareth Bale REUTERS/Leon Kuegeler
Daniel Carvajal responded with a fine solo effort and  Ronaldo  also came close a little later but the Spaniards were lucky not to concede a penalty when Ramos cleared a Maximilian Philipp effort on the line with his hand.
Soccer Football - Champions League - Borussia Dortmund vs Real Madrid - Westfalenstadion  Dortmund  Germany - September 26  2017 Real Madrid’s  Cristiano Ronaldo  celebrates scoring their third goal with Sergio Ramos and Luka Modric REUTERS/Leon Kuegeler
“We had our chances but Real did it really well ” said Dortmund’s Gonzalo Castro. “With players like Bale and  Ronaldo  they really know how to take advantage of the gaps. It is too dangerous against such teams to stand too high up the pitch.”
It was Real who scored again when Bale was given far too much space to cut in and find  Ronaldo  in the heart of the box in the 50th.
The Germans quickly pulled a goal back with Aubameyang stabbing in a Castro cross to keep the game tight  until  Ronaldo  broke clear and fired in their third goal and their 14th in the last seven Champions League matches.
Example Output: Cristiano Ronaldo

Example Input: FAIRFAX  Va. (AP) â Jon Axel Gudmundsson hit four 3-pointers and scored 24 points and  Davidson  took control early for an 86-59 win over George Mason on Sunday.
Pritchett had the first five points of an early 10-0 spurt that gave  Davidson  the lead for good  13-8. Grady had five in another 10-0 run that put the lead into double figures at 30-18. Gudmundsson then scored six in a third 10-0 run for a 45-24 lead before Livingston knocked down a 3 at the buzzer. The Wildcats shot 56 percent (18 of 32) and George Mason shot 42 (10 of 24) despite going 6 of 12 behind the arc.
Gudmundsson scored 15 points in the second half and  Davidson  shot 55 percent (17 of 31) for the easy win.
 Davidson  players had to Uber to the game after  their  bus broke down in the hotel parking lot.
Example Output: Davidson

Example Input: According to the Washington Times   Secretary Kirstjen Nielsen  revealed that the DHS prevents an average of seven people marked on the terrorist watch list a day  adding up to 50 people a week.
The numbers have  Nielsen  asking for more scrutiny on those looking to immigrate here as refugees  and defending President Trumpâs comments on tougher screening for immigrants.
âThese changes will not only improve security but importantly they will help us better assist refugees fleeing persecution â  she  said.
 She  also believes that the border security Trump has proposed  such as the wall  is an integral part of keeping America safe.
âWe cannot let this moment slip away. Now is the time â  she  said. âWe cannot afford to kick the can down the road any farther.â
 Nielsen  noted that many of the terrorist attacks dating back five years can be traced back to lax screening processes put in place by the Obama administration:
 Ms. Nielsen  said past administrations had not been as strenuous in attempting to weed out would-be terrorists as the current one  and pointed to a string of attacks dating back five years â to the heart of the Obama administration. And  she  again cited a controversial administration report that found of more than 500 people convicted of terrorism-related crimes in U.S. courts since 2001  three-quarters were foreign-born.
Example Output:
Kirstjen Nielsen