Osemsmerovka č. 10 701 - What has many keys, but can't even open a single door?

A L I B R A R Y P E I Y B A O E L Y T S G T O L A A T U N L N L X L D R O S A W I A E E W R E D I A N N R R A C E D G S I E A B Y P O S L T A P B M E N U R S E R I N U O Z T L A W T N A R G I M E O L