import java.util.*;
   import java.io.*;

    public class Jan20P2
   {
       public static void main(String[] args)throws IOException
      {
         Scanner get=new Scanner(new FileReader("DATA2.txt"));
         BufferedWriter bw = new BufferedWriter (new FileWriter("OUT2.txt"));
         for (int i=0;i<5;i++)
         {
            int num=get.nextInt();
            int [] result = new int [num];
         
            for (int j=0;j<num;j++)
            {
               result[j]=get.nextInt();
            }			
            if (verified(result))
            {
               bw.write("verified\r\n");
            }	
				else 
				{
					if (unverified(result))
					 bw.write("unverified\r\n");
					else
						bw.write("unknown\r\n");

				}
         
         }
         bw.close();
      }
   
       public static boolean verified(int [] result)
      {
         for (int i=0;i<result.length;i++)
         {
            int counter=0;
            for (int j=0;j<result.length;j++)
            {
               if (result[j]==result[i])
               {
                  counter++;
               }
            }
            if (2*counter>result.length)
               return true;
         }
         return false;
      }
       public static boolean unverified(int [] result)
      {
         int [] num = new int[result.length];
      	
         for (int i=0;i<result.length;i++)
         {
            num[i]=getHowMany(result,result[i]);
         }
         int max=0;
         for (int i=0;i<result.length;i++)
         {
            max=Math.max(max,num[i]);
         }
         int maxItem=0;
         for (int i=0;i<result.length;i++)
         {
            if (num[i]==max)
               maxItem=result[i];
         }
      	
         return (!existAnotherMaxItem(result,num,max,maxItem));
      		
      	
      }
   	
       public static int getHowMany(int [] x,int y)
      {
         int counter=0;
         for (int i=0;i<x.length;i++)
         {
            if (x[i]==y)
               counter++;
         }
         return counter;
      }
   	
       public static boolean existAnotherMaxItem(int[] result,int[] num,int max, int maxItem)
      {
         for (int i=0;i<result.length;i++)
         {
            if ((num[i]==max)&&(result[i]!=maxItem))
               return true;
         }
         return false;
      }
   }