using System;
public class Program
{
	static void Main()
	{
		int N = int.Parse(Console.ReadLine());
		bool[] numbers = new bool[10];
		for (int i = 0; i < numbers.Length; i++)
		{
			numbers[i] = true;
		}
		for (int i = 0; i < N; i++)
		{
			string[] inputs = Console.ReadLine().Split(' ');
			int[] n = new int[4];
			for (int j = 0; j < 4; j++)
			{
				n[j] = int.Parse(inputs[j]);
			}
			if (inputs[4] == "YES")
			{
				for (int j = 0; j < 10; j++){
					if (! Array.Exists(n, e => e == j))
					{
						numbers[j] = false;
					}
				}
			}
			else
			{
				for (int j = 0; j < 4; j++){
					numbers[n[j]] = false;
				}
			}
			Console.Error.WriteLine(String.Concat(numbers));
		}
		Console.WriteLine(Array.FindIndex(numbers, e => e));
	}
}