Question: How many television series did the sitcom in which Liz Smith played the role of a character called "Nana" run for?

Context paragraphs:
The Royle Family: The Royle Family is a British television sitcom produced by ITV Studios for the BBC, which ran for three series from 1998-2000, and specials from 2006-12.  It centres on the lives of a scruffy television-fixated Manchester family, the Royles, comprising family patriarch Jim Royle (Ricky Tomlinson), his wife Barbara (Sue Johnston), their daughter Denise (Caroline Aherne), their son Antony (Ralf Little) and Denise's fiancé (later husband) David (Craig Cash).

Hard Labour (film): Hard Labour is a 1973 television film, directed by Mike Leigh and produced by Tony Garnett which aired as part of the BBC anthology series "Play for Today".  The film stars Liz Smith in her first major role.  The film is the most clearly drawn in all Leigh's work from the background in Higher and Lower Broughton where he grew up.  "Though elements of autobiography are buried in all Leigh's films and plays, only "Hard Labour" is set in Salford, – the scenes in the Stones' house were shot in a house just two doors along from where the Leighs had lived in Cavendish Road."

Pirates (TV series): Pirates is a British children's television sitcom about a family of pirates living in a council house.  It featured a number of bizarre characters, such as the "Man in a Sack" and a baby in a pram which was never seen, but gave off a mysterious green glow.  The series ran from 1994 to 1997 on Children's BBC, and featured Liz Smith as "Gran".

Adrian Scarborough: Adrian Philip Scarborough (born 10 May 1968) is an English actor, most widely known for film roles including "The King's Speech" and television appearances including the sitcom "Gavin & Stacey" and his role as the butler Mr. Pritchard in the 2010 version of "Upstairs Downstairs".  He plays a children's TV character called Abney in "The Adventures of Abney & Teal".  He is also an accomplished theatre actor and won the Laurence Olivier Award for Best Performance in a Supporting Role in 2011 for his role in the Terence Rattigan play "After the Dance".  He also starred as Harry in the Starz sitcom "Blunt Talk".

Wendy Benson: Wendy Benson-Landes (born July 8, 1971) is an American actress seen in many television shows.  She played the role of Julie Harris in the 2001 biographical television movie "James Dean".  She guest starred in many television series, including "Murder, She Wrote", "The X-Files", "Charmed", "JAG", "Ugly Betty", "According to Jim", "Ghost Whisperer", "", "Desperate Housewives" and "Mad Men".

Ruben Carbajal: Rubén Carbajal (born February 26, 1993) is an American actor who has appeared on many television series.  His most watched appearance was a mini series "Kingpin".  In this series, Carbajal worked with actors such as Yancey Arias, Sheryl Lee, Bobby Cannavale, Angela Alvarado Rosa, and many more.  Rubén started his acting career with commercials when he was 5 years old, then moved to TV series acting.  Along with commercials for Chuck E. Cheese and Propositions, he was also on a college student's film One Last Run in which he starred as the son of the main character.  He has appeared on the following TV series: "Zoey 101", "Punk'd", and starred on NBC's "Kingpin".  Rubén attended Loyola High School of Los Angeles and graduated in 2011.  Rubén will be starring in the role of John Laurens/Phillip Hamilton on the national tour of "Hamilton", which opens in March 2017 in San Francisco.

Jessica Grace Smith: Jessica Grace Smith (born November 27, 1988) is a New Zealand actress, writer and director.  Smith played the role of Denny Miller on the television show "Home and Away" and Diona in the mini-series "".  Smith also appeared in the films "The Devil's Rock" and "".

Damon Dark: Damon Dark is an independent public access TV series and web series from Australia about a heroic and obsessive investigator of UFO incidents and other strange cases, created by Australian writer, actor and film maker Adrian Sherlock.  Damon James Dark became a dedicated alien investigator after a close encounter during his teenage years.  He is associated with both the secret service and friendly aliens, including a character called Vincent Kosmos (an alien time traveller) and Trans-Dimensional Control (an alien law enforcement agency).  The character of Damon Dark has appeared in a 5-week TV series on Community TV 31 in Melbourne Australia, a self-published novel ("Biodome") on Amazon's createspace platform and a long running web series on YouTube.  He has also been involved in related web series "Young Damon Dark" and "Vincent Kosmos."  He has also been the focus of a one actor stage drama.  The character of Damon Dark has been played by Adrian Sherlock, Bruce Hughes, Aiden Sherlock and Jack Knoll.  Damon Dark is a loner, dresses in black, has a huge experience of aliens and their technology.  Damon is characterized by his high intelligence, idealistic moral outlook and wry sense of humor.  His best friend in the series is the long-suffering Gary Sutton, played by actor Robert Trott.  Damon Dark began in 1999, with a five-part weekly series on Melbourne's Community TV 31, (although the pilot was shot in 1996 and the show had been in development since 1990) following a screening of a 65-minute version of the story "Maddox" at the 57th World Science Fiction Convention (Aussiecon Three) held in Melbourne.  The series was later revived as a YouTube webseries which inspired several related webseries, including "The Young Damon Dark Adventures" in which the character is played as a teenager, and Vincent Kosmos, (created by and starring Chris Heaven, , an Italian actor and musician, about a renegade alien character who is a friend of Damon.

Bodyguards (TV series): Bodyguards is a British television crime drama/action series, broadcast on ITV, that focuses on the cases of a specialized bodyguard unit, the "Close Protection Group", in service of the British government.  The series starred Sean Pertwee and Louise Lombard as protagonists Ian Worrell and Liz Shaw.  Pertwee's father, Jon, notably also starred alongside a character called Liz Shaw, played by Caroline John, who was his first companion during his time playing the Third Doctor in "Doctor Who".  The series was the brainchild of Jeffrey Caine, known as the creator of "The Chief" and script editor of the James Bond movie "GoldenEye".

Liz Smith (actress): Betty Gleadle, {'1': ", '2': ", '3': ", '4': "} (11 December 1921 – 24 December 2016), known by the stage name Liz Smith, was an English character actress, known for her roles in BBC sitcoms, including as Annie Brandon in "I Didn't Know You Cared" (1975–79), Bette and Aunt Belle in "2point4 Children" (1991–99), Letitia Cropley in "The Vicar of Dibley" (1994–96), and Norma Speakman ("Nana") in "The Royle Family" (1998–2006).  She also played Zillah in "Lark Rise to Candleford" (2008), and won the BAFTA Award for Best Actress in a Supporting Role for the 1984 film "A Private Function".

Supporting paragraphs: Liz Smith (actress) The Royle Family
Answer: three