Namisplayingwithastringonhiscomputer.ThestringconsistsofnlowercaseEnglishletters.Itismeaningless,soNamdecidedtomakethestringmorebeautiful,thatistomakeitbeapalindromebyusing4arrowkeys:left,right,up,down.Thereisacursorpointingatsomesymbolofthestring.Supposethatcursorisatpositioni(1 ≤ i ≤ n,thestringuses1-basedindexing)now.Leftandrightarrowkeysareusedtomovecursoraroundthestring.Thestri...
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