Question: Rosencrantz and Guildenstern is a parody based off a play with how many female characters?
Context: Rosencrantz and Guildenstern Are Dead, often referred to as just Rosencrantz and Guildenstern, is an absurdist, existentialist tragicomedy by Tom Stoppard, first staged at the Edinburgh Festival Fringe in 1966.  The play expands upon the exploits of two minor characters from Shakespeare's "Hamlet", the courtiers Rosencrantz and Guildenstern.  The action of Stoppard's play takes place mainly "in the wings" of Shakespeare's, with brief appearances of major characters from "Hamlet" who enact fragments of the original's scenes.  Between these episodes the two protagonists voice their confusion at the progress of events occurring onstage without them in "Hamlet", of which they have no direct knowledge. Agent Aika (Japanese: アイカ , Hepburn: Aika , stylized AIKa) is an adventure anime OVA series produced by Studio Fantasia, and directed by Katsuhiko Nishijima.  The series follows Aika Sumeragi, a salvager for hire who gets caught up in a plot for world domination.  The series was released in Japan from 1997-1999.  The anime was initially licensed by Central Park Media, but was later licensed by Bandai Entertainment.  The series is well known for its copious amounts of fan service, specifically the camera angles on panties of the many female characters that populate the show.  On April 25, 2007 the first volume of the three-part prequel OVA "", detailing Aika's time when she was 16 years old, was released in Japan.  A remastered version of the original series was released also, along with a special live-action edition of "Agent Aika".  In 2009 the OVA "AIKa ZERO" with 19-year-old Aika was released. Rosencrantz and Guildenstern, A Tragic Episode, in Three Tabloids is a short comic play by W. S. Gilbert, a parody of "Hamlet" by William Shakespeare.  The main characters in Gilbert's play are King Claudius and Queen Gertrude of Denmark, their son Prince Hamlet, the courtiers Rosencrantz and Guildenstern, and Ophelia. Rosencrantz and Guildenstern are characters in William Shakespeare's tragedy "Hamlet".  They are childhood friends of Hamlet, summoned by King Claudius to distract the prince from his apparent madness and if possible to ascertain the cause of it.  The characters were revived in W. S. Gilbert's satire, "Rosencrantz and Guildenstern", and as the alienated heroes of Tom Stoppard's absurdist play, "Rosencrantz and Guildenstern Are Dead", which was adapted into a film. Liz Callaway (born April 13, 1961) is an American actress and singer who provided the singing voices of many female characters in animated films, such as Anya/Anastasia in "Anastasia", Odette in "The Swan Princess", Jasmine in the "Aladdin" sequels "The Return of Jafar" and "Aladdin and the King of Thieves", and adult Kiara in "". Edward Petherbridge (born on 3 August 1936) is an English actor, writer and artist.  Among his many roles, he portrayed Lord Peter Wimsey in the 1987 BBC television adaptations of Dorothy L. Sayers's novels, and Guildenstern in Tom Stoppard's "Rosencrantz and Guildenstern Are Dead".  At the Royal Shakespeare Company in 1980, he was a memorable Newman Noggs in the company's adaptation of Dickens's "The Life and Adventures of Nicholas Nickleby". Rosencrantz & Guildenstern Are Dead is a 1990 comedy-drama film written and directed by Tom Stoppard based on his play of the same name.  Like the play, the film depicts two minor characters from William Shakespeare's play "Hamlet", Rosencrantz and Guildenstern, who find themselves on the road to Elsinore Castle at the behest of the King of Denmark.  They encounter a band of players before arriving to find that they are needed to try to discern what troubles the prince Hamlet.  Meanwhile, they ponder the meaning of their existence.  The movie won the Golden Lion at the 47th Venice International Film Festival. Rosencrantz and Guildenstern Are Undead is a 2009 American independent film written and directed by Jordan Galland.  The film's title refers to a fictitious play-within-the-movie, which is a comic reinterpretation of Shakespeare’s "Hamlet" and its aftermath and whose title is a reference to the play "Rosencrantz and Guildenstern are Dead".  The cast includes Devon Aoki, John Ventimiglia, Kris Lemche, Ralph Macchio, Jeremy Sisto and Waris Ahluwalia.  The film stars Jake Hoffman (son of Dustin Hoffman).  An original musical score was composed and performed by Sean Lennon. Ophelia is a character in William Shakespeare's play "Hamlet".  She is a young noblewoman of Denmark, the daughter of Polonius, sister of Laertes, and potential wife of Prince Hamlet.  She is one of only two female characters in the play. The Wife of Bath's Tale (Middle English: the Tale of the Wyf of Bathe ) is among the best-known of Geoffrey Chaucer's "Canterbury Tales".  It provides insight into the role of women in the Late Middle Ages and was probably of interest to Chaucer himself, for the character is one of his most developed ones, with her Prologue twice as long as her Tale.  He also goes so far as to describe two sets of clothing for her in his General Prologue.  She holds her own among the bickering pilgrims, and evidence in the manuscripts suggests that although she was first assigned a different, plainer tale—perhaps the one told by the Shipman—she received her present tale as her significance increased.  She calls herself both Alyson and Alys in the prologue, but to confuse matters these are also the names of her 'gossib' (a close friend or gossip), whom she mentions several times, as well as many female characters throughout "The Canterbury Tales".
Answer: two