CRDSNHUJNENEET$$MM$$IROFIFSLFIO

RZDNODOEAMRCF$$AIFADIDN$$ABNPBU

KPJMCOIO$$SAUIFCFCUITTDS$$NGIVF

RJJBHIBUB$$ENEEZPI$$N$$DVMLBZJBE

ULSCTB$$OANJZJPAKSNFNLZMVZ$$ES

SLTH$$NNIKDOEAJR$$L$$SABFG$$PBT$$V

$$U$$NZNLSSC$$BBDPHTR$$EDKRHFBLOD

MTRZRDPGAPZHNSAUTJZMRUFJCOLSK

ZKZ$$OESE$$UNRV$$SZMTRVFS$$HS

MRGDFBRAAILSZ$$Z$$M$$VLMDRECDN$$U

NFO$$NUIKZSRHJBZK$$IEBURJPGOILI

U$$ECCN$$KKDSZTBKJBEKRJBJJBO

ULSF$$FCPV$$IS$$IFIOIHIO$$LAFEEN

RDOR$$IDCFCIAVNMVODMTRZFIMN$$KZ

FVBODMTT$$MMJ$$TNSSA$$ZDMLZAGEAZ

OKRRFIO$$DHZFVCFOD$$VNPNM$$AVAIL

I$$DMEUSFI$$IA$$H$$GMRFGA

this is a vigener cypher, what would be the key if the aplhabet used is slovenian with a length of $25$