Midnight Horror School
Genres: Comedy
Type: TV, Episodes: 52
Aired: Oct 1, 2003 to Mar 24, 2004
Source: Unknown
Synopsis:
The school has 26 students with each name of them beginning with a letter of the alphabet in order and a color, 3 teachers, 3 classrooms, a library, a cafeteria, a music room, a playroom, a fountain, a skeleton playground, a graveyard and several school staff. 

(Source: Wikipedia)