Given the task definition and input, reply with output. In this task, you are given a set of context paragraphs, some supporting facts and an answer of a question. Your task is to generate question for given answer based on set of context paragraphs, supporting facts and an answer.

Context_1 : CBS Evening News is the flagship evening television news program of CBS News, the news division of the CBS television network in the United States. The program has been broadcast since May 3, 1948 under the original title "CBS Television News", eventually adopting its current title in 1963. Since June 19, 2017, the program is anchored by Anthony Mason on an interim basis. Previous anchors have included Douglas Edwards, Walter Cronkite, Dan Rather, Connie Chung, Bob Schieffer, Katie Couric and Scott Pelley. Context_2 : Terry Drinkwater (May 9, 1936 May 31, 1989) was an American television and radio journalist most widely known for his quarter-century career as a correspondent for CBS News. Drinkwater was also an anchorman for the West Coast editions of the "CBS Evening News", covering events that occurred after the East Coast version with Walter Cronkite aired. Context_3 : Walter Leland Cronkite Jr. (November 4, 1916 July 17, 2009) was an American broadcast journalist, best known as anchorman for the "CBS Evening News" for 19 years (19621981). During the heyday of CBS News in the 1960s and 1970s, he was often cited as "the most trusted man in America" after being so named in an opinion poll. Context_4 : Daniel Irvin Rather Jr. (born October 31, 1931) is an American journalist and the former news anchor for the "CBS Evening News." He was most recently managing editor and anchor of the television news magazine "Dan Rather Reports" on the cable channel AXS TV. Rather was anchor of the "CBS Evening News" for 24 years, from March 9, 1981, to March 9, 2005. He also contributed to CBS's "60 Minutes". Rather became embroiled in controversy about a disputed news report involving President George W. Bush's Vietnam-era service in the National Guard and subsequently left "CBS Evening News" in 2005, and he left the network entirely after 44 years in 2006. Context_5 : Thornwillow Press is one of the private presses in the United States. Beginning in 1985, Thornwillow has published the original work of John Updike, Arthur Schlesinger, JP Donleavy, Edmund Morris, Warren Berger, Louis Auchincloss, James Merrill, Hugh Sidey, and Walter Cronkite, among others. All Thornwillow books are published in limited editions (usually under five hundred copies) and are printed letterpress and hand-bound. As such, they are often prized by collectors, and are included in the permanent collections of The White House, The Morgan Library, The Beinecke at Yale, The Houghton at Harvard, among others. Presidents George W. Bush and Bill Clinton gave Thornwillow books as state gifts. Context_6 : Roger Harrison Mudd (born February 9, 1928) is an American broadcast journalist, most recently working as the primary anchor for The History Channel. Previously, Mudd was weekend and weekday substitute anchor for the "CBS Evening News", the co-anchor of the weekday "NBC Nightly News", and the host of the NBC-TV "Meet the Press," and "American Almanac" TV programs. Mudd is the winner of the Peabody Award, the Joan Shorenstein Award for Distinguished Washington Reporting, and five Emmy Awards. Context_7 : Sanford Socolow (November 11, 1928 January 31, 2015) was an American broadcast journalist who worked at CBS News from 1956 to 1988. He was executive producer of "The CBS Evening News with Walter Cronkite" from 1978 to 1981. Context_8 : Arnold L. Zenker (born 1938) is a retired media broadcaster and public appearance counselor who gained brief stardom by sitting in for Walter Cronkite on the "CBS Evening News" in 1967. Zenker studied at the University of Pennsylvania in Philadelphia, from which he received an undergraduate and a law degree. In 1967 at the age of 28, he was asked to sit in for anchor Walter Cronkite to deliver the nightly news. Zenker, working as a Manager of News Programming at CBS at the time, was chosen because a strike by the American Federation of Television and Radio Artists left the network without an immediate substitute. Context_9 : Burton Richard Benjamin (October 9, 1917 September 18, 1988) was a vice president and director of CBS News. He worked at CBS for 29 years, as a writer, producer, and executive. In that time, he was director of CBS News from 1978 to 1981 and executive producer of "CBS Evening News" from 1975 to 1978. He was a senior executive producer from 1968 to 1975 and from 1981 to 1985. At CBS, Benjamin often produced programs with Walter Cronkite. Context_10 : The Huntley-Brinkley Report (sometimes known as The Texaco Huntley-Brinkley Report for one of its early sponsors) was NBC's flagship evening news program from October 29, 1956, to July 31, 1970. It was anchored by Chet Huntley in New York City, and David Brinkley in Washington, D.C. It succeeded the "Camel News Caravan", anchored by John Cameron Swayze. The program ran for 15 minutes at its inception but expanded to 30 minutes on September 9, 1963, exactly a week after the "CBS Evening News" with Walter Cronkite did so. It was developed and produced initially by Reuven Frank. Frank left the program in 1962 to produce documentaries (Eliot Frankel replaced him) but returned to the program the following year when it expanded to 30 minutes. He was succeeded as executive producer in 1965 by Robert "Shad" Northshield and by Wallace Westfeldt in 1969. fact_1 : Beginning in 1985, Thornwillow has published the original work of John Updike, Arthur Schlesinger, JP Donleavy, Edmund Morris, Warren Berger, Louis Auchincloss, James Merrill, Hugh Sidey, and Walter Cronkite, among others. fact_2 : Walter Leland Cronkite Jr. (November 4, 1916 July 17, 2009) was an American broadcast journalist, best known as anchorman for the "CBS Evening News" for 19 years (19621981). Answer: 19
Thornwillow Press is one of the private presses in the United States, beginning in 1985, Thornwillow has published the original work of Walter Leland Cronkite Jr., was an American broadcast journalist, best known as anchorman for the CBS Evening News for how many years?