using System;
public class Program
{
    static void Main()
    {
        var n = (int)ReadLineLong()[0];
        var abcdr = Enumerable.Range(0, n).Select(_ => ReadLineSplit()).ToArray();
        var abcd = abcdr.Select(x => (new int[] { int.Parse(x[0]), int.Parse(x[1]), int.Parse(x[2]), int.Parse(x[3]) }, x[4])).ToArray();
        var set = new HashSet<int>([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
        foreach (var (x, r) in abcd)
        {
            switch (r)
            {
                case "YES":
                    set.RemoveWhere(a => !x.Contains(a));
                    break;
                case "NO":
                    set.RemoveWhere(a => x.Contains(a));
                    break;
                default:
                    return;
            }
            if (set.Count <= 1) break;
        }
        Console.WriteLine(set.First());
    }

    static string[] ReadLineSplit()
    {
        var s = Console.ReadLine() ?? "";
        return s.Split(' ');
    }
    static long[] ReadLineLong()
    {
        var s = Console.ReadLine() ?? "";
        return s.Split(' ').Select(long.Parse).ToArray();
    }
}