using System;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int[,] a = new int[n, 4];
        string[] r = new string[n];
        for (int i = 0; i < n; i++)
        {
            string[] s = Console.ReadLine().Split();
            r[i] = s[4];
            for (int j = 0; j < 4; j++)
            {
                a[i, j] = int.Parse(s[j]);
            }
        }

        string ans = "0123456789";

        for (int i = 0; i < n; i++)
        {
            if (r[i] == "YES")
            {
                string s = "";
                for(int j = 0; j < 4; j++)
                {
                    if (ans.Contains(a[i, j].ToString()))
                    {
                        s += a[i, j].ToString();
                    }
                }
                ans = s;
            }
            else
            {
                for(int j = 0; j < 4; j++)
                {
                    ans = ans.Replace(a[i, j].ToString(), "");
                }
            }
        }

        Console.WriteLine(ans);
    }
}