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: Delonda Walker  alerted police Tuesday after suspect Howell Donaldson III  24  handed  her  a McDonald's food bag containing a .40-caliber Glock  which Tampa police later said matched the murder weapon used in all four shootings that occurred in the Seminole Heights neighborhood between Oct. 9 and Nov. 14.
Donaldson allegedly told  Walker  that he planned to leave the state.  Walker  then approached a police officer who happened to be at the Ybor City McDonald's to turn over the bag  officials said.
In a statement read by Buckhorn in a press conference Friday   Walker  said  "receiving a reward never entered my mind."
"I went to work on Tuesday intending to serve customers and do my job. The day turned out very differently "  she  said. "When confronted with this situation  I wanted to do the right thing and I reached out to a nearby police officer."
 Walker  said  she  is "grateful" that  she  was able to assist law enforcement but requested privacy amid the ongoing investigation.
"... I appreciate all the well wishes and kind words from our community "  she  said.
Buckhorn praised Walker for  her  actions.
" She  is what’s right about this city " Buckhorn said.
Example Output: Delonda Walker

Example Input: "The conventional approach to developing flu vaccines today is one in which we perform surveillance worldwide " said David Topham  director of the New York Influenza Center of Excellence and professor of microbiology and immunology at the University of Rochester in New York.
"We collect the viruses that are circulating in people " said  Topham  who was not involved in the new study . Those viruses then typically are studied in ferrets    he  said.
"We create an antigenic map of each virus and determine how similar or different that is than the (current) vaccine strain  and if it's different enough from the vaccine strain then we select that virus to be in  next year's vaccine " Topham  said. In other words  they make their best guess on what strains will be most likely to spread and cause illness based on surveillance data
On the other hand  the new study suggests "using high-throughput sequencing methods and genetic engineering to rationally design a virus to use as a vaccine "  he  said. "I thought it was a very innovative and comprehensive approach."
The new study acted like "rocket science" compared with the conventional approach used to develop flu vaccines   he  said.
So what does the future hold for flu vaccines and where could this new approach fit in? There has been a shift among researchers around the world to focus on developing universal vaccines   Topham  said.
"These  for influenza  would be vaccines that would last for at least five years and protect against 75% of the viruses that are out there "  he  said. "There are many ways that we might be able to achieve that. This approach that's described in this paper is just one approach."
Example Output: Topham

Example Input: Objectively   the sketch is bad . The thick lines look like an inverted triangle with hair   or a strawberry wearing a tiny cap . The two dot eyes are inexplicably paired with horizontal lines and no eyebrows . There is only one ear . And yet   the Lancaster   Pa .  police say they have identified a suspect who they say pretended to be a farmers market worker before fleeing with cash Jan . 30   thanks to a witness who drew a picture from memory . The sketch was " amateurish and cartoonish  " local police said Wednesday in a Facebook post . But the sketch   along with a physical description of the thief   reminded at least one officer of an encounter with  Hung Phuoc Nguyen   44  . Police then showed the witness photos of possible suspects   including  Nguyen  . The witness identified  Nguyen    and police issued a warrant for two counts of theft . Officer William Hickey of the Lancaster police told The Washington Post on Thursday that he did not know whether  Nguyen  was apprehended . The police have insisted that the sketch was a serious effort to find the suspect . " We released all of those details together in our police log in the hope that someone recognizes the suspect  " Lancaster city police said in a Facebook post   according to Lancaster Online . " This was not done in jest ." The outlet described Nguyen as homeless . In an age of omnipresent surveillance video   the police sketch quietly endures . More departments are opting for software that can spit out composite photos   but departments will sometimes share artists with nearby cities that have modest personnel budgets . " Technology and machinery is cold  " Wayne Promisel   a detective with the Loudoun County Sheriff ' s Office in Virginia and a former Fairfax County police detective   told The Washington Post in 2013 . " It is also missing the ability to ask the questions in a certain way in an interview while having a sense of compassion " for victims . Speaking about the witness   Hickey said : " We appreciated their effort and continued cooperation . People like that make our job easier [ and ] more enjoyable ." But there are currently no plans to offer the witness a position as a sketch artist   he said .
Example Output:
Hung Phuoc Nguyen