input: NBC became the first large United States network to broadcast the same show every weekday during prime time since ABC's Who Wants to Be a Millionaire? marathons in 1999 and only the second since DuMont aired Captain Video and His Video Rangers from 1949 to 1955. More recently, the upstart MyNetwork TV had attempted, upon its launch in 2006, to air the same telenovelas every night of the week, a programming strategy that proved to be very unsuccessful. NBC's executives called the decision "a transformational moment in the history of broadcasting" and "in effect, launching five shows." An industry observer said that Leno, "in all my years, is the biggest risk a network has ever taken." According to former NBC president Fred Silverman, "If the Leno Show works, it will be the most significant thing to happen in broadcast television in the last decade."  Although NBC had not developed a new hit show at 10 pm in years, industry executives criticized the network for abandoning a history of airing quality dramas at that hour such as Hill Street Blues, St. Elsewhere, and ER, which made NBC "the gold standard for sophisticated programming . . . the No. 1 network for affluent and well-educated young viewers" during the 1980s and 1990s. In addition, critics predicted that the decision would hurt NBC by undermining a reputation built on successful scripted shows. Other networks believed NBC's decision created an opportunity, and planned their 2009-2010 schedules accordingly. For example, the show competed with The Mentalist, CSI: Miami, CSI: NY, and Numb3rs, four of television's most popular series, on CBS (the first of those four series was moved to 10:00 PM to directly compete with Leno's show, and significantly improved the ratings for that timeslot compared to its predecessor). Leno was also not easily sold overseas.  The January 29, 2010 issue of Entertainment Weekly listed the show at the top of a list of the 50 Biggest Bombs in television history. The comment made by the network executives about "launching five shows" was ultimately transformed into the joke that its removal was like "cancelling five shows". TV Guide similarly listed the show as the biggest blunder in television history in its November 1, 2010 edition.

Answer this question "Did Leno replace another talk show?"
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Problem: Background: David Gaub McCullough (; born July 7, 1933) is an American author, narrator, historian, and lecturer. He is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom, the United States' highest civilian award. Born and raised in Pittsburgh, McCullough earned a degree in English literature from Yale University.
Context: McCullough was born in the Point Breeze neighborhood of Pittsburgh, Pennsylvania, the son of Ruth (nee Rankin) and Christian Hax McCullough. He is of Scots-Irish descent. He was educated at Linden Avenue Grade School and Shady Side Academy, in his hometown of Pittsburgh. One of four sons, McCullough had a "marvelous" childhood with a wide range of interests, including sports and drawing cartoons. McCullough's parents and his grandmother, who read to him often, introduced him to books at an early age. His parents often talked about history, a topic he says should be discussed more often. McCullough "loved school, every day"; he contemplated many career choices, ranging from architect, actor, painter, writer, to lawyer, and contemplated attending medical school for a time.  In 1951, McCullough began attending Yale University. He said that it was a "privilege" to study English at Yale because of faculty members such as John O'Hara, John Hersey, Robert Penn Warren, and Brendan Gill. McCullough occasionally ate lunch with the Pulitzer Prize-winning novelist and playwright Thornton Wilder. Wilder, says McCullough, taught him that a competent writer maintains "an air of freedom" in the storyline, so that a reader will not anticipate the outcome, even if the book is non-fiction.  While at Yale, he became a member of Skull and Bones. He served apprenticeships at Time, Life, the United States Information Agency, and American Heritage, where he enjoyed research. "Once I discovered the endless fascination of doing the research and of doing the writing, I knew I had found what I wanted to do in my life." While attending Yale, McCullough studied Arts and earned his bachelor's degree in English, with the intention of becoming a fiction writer or playwright. He graduated with honors in English literature (1955).
Question: When did he graduate?
Answer: graduated with honors in English literature (1955).

Question: Muhammed Fethullah Gulen Hocaefendi (Turkish: [fetul'lah jy'len] - the honorific Hoca Efendi, used among followers, translates to "respected teacher"); born 27 April 1941 is a Turkish preacher, former imam, writer, and political figure. He is the founder of the Gulen movement (known as Hizmet meaning service in Turkish), which is 3 to 6 million strong in Turkey and has an empire of affiliated banks, media, construction companies, and schools, especially those providing primary and secondary education, in Turkey (in which business entities and foundations have been closed down by the Turkish government by the thousands in 2017) and in Africa, Central Asia, the Americas, and Europe. Hizmet's most populous organization is a moderate Islamic advocacy group, Alliance for Shared Values.

Despite Gulen's and his followers' claims that the organization is non-political in nature, analysts believed that a number of corruption-related arrests made against allies of Turkish Prime Minister Recep Tayyip Erdogan reflect a growing political power struggle between Gulen and Erdogan. These arrests led to the 2013 corruption scandal in Turkey, which the ruling Justice and Development Party (AKP)'s supporters (along with Erdogan himself) and the opposition parties alike have said were choreographed by Gulen after Erdogan's government came to the decision early in December 2013 to shut down many of his movement's private pre-university schools in Turkey.  The Erdogan government has said that the corruption investigation and comments by Gulen are the long term political agenda of Gulen's movement to infiltrate security, intelligence, and justice institutions of the Turkish state, a charge almost identical to the charges against Gulen by the Chief Prosecutor of Turkey in his trial in 2000 before Erdogan's party had come into power. Gulen had previously been tried in absentia in 2000, and acquitted of these charges in 2008 under Erdogan's AKP government.  In emailed comments to the Wall Street Journal in January 2014, Gulen said that "Turkish people ... are upset that in the last two years democratic progress is now being reversed", but he denied being part of a plot to unseat the government. Later, in January 2014 in an interview with BBC World, Gulen said "If I were to say anything to people I may say people should vote for those who are respectful to democracy, rule of law, who get on well with people. Telling or encouraging people to vote for a party would be an insult to peoples' intellect. Everybody very clearly sees what is going on."  According to some commentators, Gulen is to Erdogan what Trotsky was to Stalin. Ben Cohen wrote: "Rather like Leon Trotsky, the founder of the Soviet Red Army who was hounded and chased out of the USSR by Joseph Stalin, Gulen has become an all-encompassing explanation for the existential threats, as Erdogan perceives them, that are currently plaguing Turkey. Stalin saw the influence of "Trotskyite counter-revolutionaries" everywhere, and brutally purged every element of the Soviet apparatus. Erdogan is now doing much the same with the "Gulenist terrorists."

Using a quote from the above article, answer the following question: When was the split with erdogan?
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