Zhao fan went to the library and climbed straight to the fourth floor, where he collected all kinds of books related to Warcraft. In fact, each floor of the library is ten meters high. Zhao fan climbed to the fourth floor and went straight to the management desk on the fourth floor.

"is there a detailed introduction to the level 5 and level 6 Warcraft atlas and characteristics of Warcraft?" Zhao fan, lying on the platform, asked the librarian sitting inside.

"yes, they are all on bookshelf 6 in that area." As soon as the administrator pointed to a row of bookshelves in the distance, after giving Zhao fan instructions,...