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

public class prob2 {
	
	public static void main (String[] args) throws IOException{
		File in = new File ("DATA2.txt");
		Scanner scan = new Scanner(in);
		
		File out = new File("OUT2.txt");
		PrintWriter pw = new PrintWriter (out);
		
		
		for (int i=0; i<5; i++){
			double numNext=scan.nextInt();
			int[] array = new int[50];
			int[] count = new int[101];
			int biggest=-1;
			boolean check = false;
			
			for(int j=0; j<numNext; j++){
				array[j]=scan.nextInt();
			}
			
			for(int k=0; k<numNext; k++){
				count[array[k]]++;
			}
			
			for(int l=0; l<numNext; l++){
				if(count[array[l]]>biggest){
					biggest=array[l];
									}
			}

			for(int m=0; m<=100; m++){
				if(m==biggest){
					continue;
				}
				
					if(count[biggest]>=(numNext/2)){
						
						pw.println("verified");
						break;
					}
					for(int n=0; n<=100; n++){
						if (n != biggest){
						
						if(count[biggest]==count[n]){
							pw.println("unknown");
							check=true;
							break;
					}
					}
				
				}
				if(check){
					break;
				}
					else{
						pw.println("unverified");
						break;
					}
			}
		}
		pw.close();
	}
}