using System;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] list =
        {
            0, 1, 2, 3, 4, 5, 6, 7, 8, 9
        };
        int n = int.Parse(Console.ReadLine());
        for(int i = 0; i < n; i++)
        {
            string[] s = Console.ReadLine().Split();
            int[] num = new int[4];
            for(int j = 0; j < 4; j++)
            {
                num[j] = int.Parse(s[j]);
            }
            if(s[4] == "YES")
            {
                list = list.Where(a => num.Contains(a)).ToArray();
            }
            else
            {
                list = list.Where(a => !num.Contains(a)).ToArray();
            }
        }
        Console.WriteLine($"{list[0]}");
    }
}