Find the flag in the substitution cipher!

Nw fw uldumgrnwfeex vng ukuwrwj ufqex rw Zaex f xnawj ofw dfou nag nb gvu jfqqug rw cvrdv vu ensjus rw P. Mefdu fws cfetus pencex, fp gvnajv rw vuprgfgrnw, gncfqsp T. yqrsju. Vu vfs padduppbaeex fknrsus ouugrwj vrp efwsefsx nw gvu pgfrqdfpu. Vrp jfqqug cfp awsuq gvu qnnb nb f vrjv, brku-pgnqrus vnapu fws cfp onqu ertu f damynfqs gvfw f qnno. Gvu efwsefsx cvn mqnkrsus vro crgv jfqqug, srwwuqp, fws fgguwsfwdu, erkus nw gvu bennq yuenc, fws ukuqx grou vu cuwg nag vu cfp nyerjus gn mfpp vuq trgdvuw, gvu snnq nb cvrdv rwkfqrfyex pgnns nmuw. Fws ufdv grou vu mfppus, gvu xnawj ofw vfs f prdt, bqrjvguwus buuerwj, cvrdv ofsu vro pdnce fws buue fpvfous. Vu cfp vnmueuppex rw suyg gn vrp efwsefsx, fws cfp fbqfrs nb ouugrwj vuq. Gvrp cfp wng yudfapu vu cfp dncfqsex fws fyzudg, hargu gvu dnwgqfqx; yag bnq pnou grou mfpg vu vfs yuuw rw fw nkuqpgqfrwus rqqrgfyeu dnwsrgrnw, kuqjrwj nw vxmndvnwsqrf. Vu vfs yudnou pn dnomeuguex fypnqyus rw vropueb, fws rpnefgus bqno vrp bueencp gvfg vu squfsus ouugrwj, wng nwex vrp efwsefsx, yag fwxnwu fg fee. Vu cfp dqapvus yx mnkuqgx, yag gvu fwlrugrup nb vrp mnprgrnw vfs nb efgu dufpus gn curjv amnw vro. Vu vfs jrkuw am fgguwsrwj gn ofgguqp nb mqfdgrdfe romnqgfwdu; vu vfs enpg fee suprqu gn sn pn. Wngvrwj gvfg fwx efwsefsx dnaes sn vfs f qufe guqqnq bnq vro. Yag gn yu pgnmmus nw gvu pgfrqp, gn yu bnqdus gn erpguw gn vuq gqrkrfe, rqqueukfwg jnpprm, gn mupguqrwj suofwsp bnq mfxouwg, gvqufgp fws dnomefrwgp, fws gn qfdt vrp yqfrwp bnq uldapup, gn mqukfqrdfgu, gn eru-wn, qfgvuq gvfw gvfg, vu cnaes dquum sncw gvu pgfrqp ertu f dfg fws perm nag awpuuw. Gvrp ukuwrwj, vncukuq, nw dnorwj nag rwgn gvu pgquug, vu yudfou fdaguex fcfqu nb vrp bufqp. "R cfwg gn fgguomg f gvrwj ertu gvfg fws fo bqrjvguwus yx gvupu gqrbeup," vu gvnajvg, crgv fw nss poreu. "Vo... xup, fee rp rw f ofw'p vfwsp fws vu eugp rg fee perm bqno dncfqsrdu, gvfg'p fw flrno. Rg cnaes yu rwguqupgrwj gn twnc cvfg rg rp ouw fqu onpg fbqfrs nb. Gftrwj f wuc pgum, agguqrwj f wuc cnqs rp cvfg gvux bufq onpg... Yag R fo gfetrwj gnn oadv. Rg'p yudfapu R dvfgguq gvfg R sn wngvrwj. Nq muqvfmp rg rp gvfg R dvfgguq yudfapu R sn wngvrwj. R'ku eufqwus gn dvfgguq gvrp efpg onwgv, exrwj bnq sfxp gnjugvuq rw ox suw gvrwtrwj... nb Zfdt gvu Jrfwg-treeuq. Cvx fo R jnrwj gvuqu wnc? Fo R dfmfyeu nb gvfg? Rp gvfg puqrnap? Rg rp wng puqrnap fg fee. Rg'p promex f bfwgfpx gn foapu oxpueb; f mefxgvrwj! Xup, ofxyu rg rp f mefxgvrwj." Gvu vufg rw gvu pgquug cfp guqqryeu: fws gvu frqeuppwupp, gvu yapgeu fws gvu mefpguq, pdfbbnesrwj, yqrdtp, fws sapg fee fynag vro, fws gvfg pmudrfe Muguqpyaqj pguwdv, pn bforerfq gn fee cvn fqu awfyeu gn jug nag nb gncw rw paoouq-fee cnqtus mfrwbaeex amnw gvu xnawj ofw'p fequfsx nkuqcqnajvg wuqkup. Gvu rwpabbuqfyeu pguwdv bqno gvu mng-vnapup, cvrdv fqu mfqgrdaefqex waouqnap rw gvfg mfqg nb gvu gncw, fws gvu sqawtuw ouw cvno vu oug dnwgrwafeex, fegvnajv rg cfp f cnqtrwj sfx, dnomeugus gvu quknegrwj orpuqx nb gvu mrdgaqu. Fw ulmqupprnw nb gvu mqnbnawsupg srpjapg jeufous bnq f onouwg rw gvu xnawj ofw'p qubrwus bfdu. Vu cfp, yx gvu cfx, uldumgrnwfeex vfwspnou, fynku gvu fkuqfju rw vurjvg, pero, cuee-yareg, crgv yufagrbae sfqt uxup fws sfqt yqncw vfrq. Pnnw vu pfwt rwgn suum gvnajvg, nq onqu fddaqfguex pmuftrwj rwgn f dnomeugu yefwtwupp nb orws; vu cfetus fenwj wng nypuqkrwj cvfg cfp fynag vro fws wng dfqrwj gn nypuqku rg. Bqno grou gn grou, vu cnaes oagguq pnougvrwj, bqno gvu vfyrg nb gfetrwj gn vropueb, gn cvrdv vu vfs zapg dnwbuppus. Fg gvupu onouwgp vu cnaes yudnou dnwpdrnap gvfg vrp rsufp cuqu pnougroup rw f gfwjeu fws gvfg vu cfp kuqx cuft; bnq gcn sfxp vu vfs pdfqduex gfpgus bnns. BEFJ{jnns_zny_crgv_gvu_paypgrgagrnw}