using S=System.Console;class P{static void Main(){var s="[";int i=int.Parse(S.ReadLine()),j;for(;i-->0;s+=i>0?"], ":"]"){s+="[";for(j=int.Parse(S.ReadLine());j-->0;)s+=S.ReadLine()+(j>0?", ":"");}S.Write(s+"]");}}