import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int SIZE = 10;
		
		final int N = sc.nextInt();
		
		boolean[] answer = new boolean[SIZE];
		Arrays.fill(answer, true);
		for(int i = 0; i < N; i++){
			boolean[] cur = new boolean[SIZE];
			for(int j = 0; j < 4; j++){
				cur[sc.nextInt()] = true;
			}
			
			String ret = sc.next();
			
			if("NO".equals(ret)){
				for(int j = 0; j < SIZE; j++){
					if(cur[j]){
						answer[j] = false;
					}
				}
			}else{
				for(int j = 0; j < SIZE; j++){
					if(!cur[j]){
						answer[j] = false;
					}
				}
			}
		}
		
		for(int i = 0; i < SIZE; i++){
			if(answer[i]){
				System.out.println(i);
				break;
			}
		}
		
	}
	
}