using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace yukicore
{
    //this algorithm think by claclator
    class Element<T> where T : IEquatable<T>
    {
        public IEnumerable<T> nums;
        public Element(IEnumerable<T> nums) => this.nums = nums;
        public Element(Element<T> e) => this.nums = e.nums;

        public static Element<T> operator -(Element<T> a, Element<T>  b) 
        {
            List<T> rtn = new List<T>();
            foreach (var num in a.nums)
            {
                if (b.nums.All(x => !x.Equals(num)))
                    rtn.Add(num);
            }
            return new Element<T>(rtn);  
        }

        public static Element<T> operator +(Element<T> a, Element<T> b)
        {
            var rtn = new List<T>();
            rtn.AddRange(a.nums);
            rtn.AddRange(b.nums);
            return new Element<T>(rtn.Distinct().ToArray());
        }

        public static Element<T> operator *(Element<T> a, Element<T> b)
        {
            var rtn = new List<T>();
            foreach (var num in a.nums)
            {
                if (b.nums.Contains(num))
                    rtn.Add(num);
            }
            return new Element<T>(rtn.ToArray());
        }
    }

    internal class Program
    {
        private static void Main(string[] args)
        {
            Element<int> mother = new Element<int>(Enumerable.Range(0, 10));
            Element<int> rtn = new Element<int>(Enumerable.Range(0, 10));
            Console.ReadLine();
            while (true)
            {

                var tmp = Console.ReadLine();
                if (tmp == null || tmp == "") break;
                var spl = tmp.Split(' ');
                var inputs = spl.Take(4).Select(x => int.Parse(x)).ToArray();
                var flag = spl.Last() == "YES" ? true : false;
                Element<int> input;
                if (flag)
                    input = new Element<int>(inputs);
                else
                    input = new Element<int>(mother - new Element<int>(inputs));
                rtn *= input;
            }

            Console.WriteLine(
                rtn.nums.ToArray()[0]);
        }
    }

}