Question: What was the name of the fictional high school attended by Charlene "Cha Cha" DiGregorio, Danny, and Sandy in Grease? 

Context paragraphs:
Annette Charles: Annette Charles (born Annette Cardona; March 5, 1948 – August 3, 2011) was an American actress best known for her role as Charlene "Cha Cha" DiGregorio in the 1978 feature film "Grease".  She made several appearances on television as well.

Waxahachie High School: Waxahachie High School is a public high school in the city of Waxahachie, Texas, USA and classified as a 5A school by the UIL.  It is a part of the Waxahachie Independent School District located in central Ellis County.  Waxahachie Ninth Grade Academy, with an additional 709 students, is a nearby branch of the high school attended by all freshman.  In 2015, the school was rated "Met Standard" by the Texas Education Agency.

William Howard Taft High School (Chicago): William Howard Taft High School is a public 4–year high school located in the Norwood Park neighborhood on the northwest side of Chicago, Illinois, United States.  Taft serves communities on the far northwest side, specifically Norwood Park, Edison Park, Jefferson Park, Forest Glen and O'Hare.  Taft is operated by the Chicago Public Schools district.  The school is perhaps most famous as the high school attended by Jim Jacobs, the writer of "Grease".  Jacobs used Taft as an inspiration in writing the musical.  Taft's NJROTC unit has won a Distinguished Unit award every year since 2001.  Since 2014, Taft High School has been considered a "wall-to-wall" IB school as part of the International Baccalaureate foundation.  Taft high school has offered the International Baccalaureate program since 2001.

Del Norte High School (Crescent City, California): Del Norte High School or DNHS, located in Crescent City, California, is a public high school educating students from grades 9 through 12.  It is the only regular public high school in Del Norte County.  In 2008 DNHS was accredited for six years (through 2014) by the Western Association of Schools and Colleges.  The principal is Coleen Parker, and the vice principals are Randy Fugate and Robert Hadfield.  In popular culture, Del Norte High School is the school attended by Laurel Sewell and her friends in the best-selling young adult novel, Wings.

Charlene Robinson: Charlene Edna "Lenny" Robinson (also Mitchell) is a fictional character from the Australian soap opera "Neighbours" played by Kylie Minogue.  Charlene was introduced to the show along with several new characters, as part of a revamp by Network Ten to increase ratings.  Minogue auditioned for the role in 1985, shortly after finishing her high school exams.  She attended the audition dressed as the character and casting director Jan Russ cast her in the role.  Minogue was initially contracted for a week, but this was later extended through to mid-1988.  She made her first screen appearance during the episode broadcast on 17 April 1986.

List of Kill la Kill characters: The anime series Kill la Kill, produced by Trigger, features a cast of characters with a variety of designs and abilities.  , a fictional high school situated in Tokyo Bay, Japan, the characters consist mainly of students who wear , which give their wearers superhuman abilities.  The main protagonist Ryuko Matoi is a transfer student who searches for her father's killer, going against the iron-fisted student council president, Satsuki Kiryuin, and then her mother's fashion empire.

The Oracle (Sweet Valley): The Oracle was the fictional High School newspaper in the "Sweet Valley High" book series.  It was well-run and mostly very informative.  Elizabeth Wakefield was the most dedicated staff member and most of her friends worked with her.  The editor-in-chief was Penny Ayala, who saw this as a step to being an editor of an international newspaper, and it was because of that reason that she and Elizabeth were close friends.  Other staff members included Arts editor Olivia Davidson; John Pfeifer, who was sports editor until he pursued a vicious vendetta against Lila Fowler; Abbie Richardson who was the staff cartoonist (she created and drew the comic strip, "Jenny"); and Jeffrey French who was one of several photographers along with Penny's younger sister, Tina Ayala and Allen Walters.

Grease (film): Grease is a 1978 American musical romantic comedy film based on Jim Jacobs and Warren Casey's musical of the same name.  Written by Bronte Woodard and directed by Randal Kleiser in his theatrical feature film debut, the film depicts the life of Rydell High School students Danny (John Travolta) and Sandy (Olivia Newton-John) in the late 1950s.  "Grease" was successful both critically and commercially.  Its ended 1978 as the second-best selling album of the year in the United States, behind the of the 1977 blockbuster "Saturday Night Fever".

Mary Is Happy, Mary Is Happy: Mary Is Happy, Mary Is Happy is a Thai coming-of-age film written and directed by Nawapol Thamrongrattanarit, starring Patcha Poonpiriya, Chonnikan Netjui and Wasupol Kriangprapakit.  The film was created from 410 tweets of @marylony in chronological order which revolves around "Mary" (Patcha Poonpiriya) and her friend "Suri" (Chonnikan Netjui) who were studying in a fictional high school.  The film was one of three films which were developed, produced and funded by Venice Biennale in 2013 and had its world premiere at the Venice Film Festival.

East Los High: East Los High is a five-time Emmy nominated Hulu original series that revolves around the lives of a group of teens navigating their final years at a fictional high school in East LA.  Created, written, and produced by Wise Entertainment, the series is Hulu's first and only series with an all Latino cast and crew and is predominantly filmed in East Los Angeles.  The producers of the show work closely with numerous public health organizations to incorporate information within the storylines that encourage young Latinos to make healthy life choices.

Supporting paragraphs: Annette Charles Grease (film)
Answer: Rydell High School