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using System;

namespace DiscraKursach
{
    class Program
    {
        static void Main(string[] args)
        {
            
            int n, m;//n - кол-во монет, m - кол-во взвешиваний
            string[] nums_strings = Console.ReadLine().Split();
            n = int.Parse(nums_strings[0]);
            m = int.Parse(nums_strings[1]);
            int suspect =0;
            int unclear =0;
            int[] nomera;
            int[] moneti = new int[n+1];           
            int pi;
            string znac;
            for (int i = 0; i < m; i++)
            {
                 nums_strings = Console.ReadLine().Split();
                pi = Convert.ToInt32(nums_strings[0]);
                nomera = new int[pi*2];
                for (int j = 0; j < pi*2; j++)
                {
                    nomera[j] = Convert.ToInt32(nums_strings[j+1]);
                }
                znac = Console.ReadLine();
                if (znac == "=")
                {
                    for (int j = 0; j < pi * 2; j++)
                    {
                        moneti[nomera[j]] = 2;
                    }
                }
                else
                {
                    for (int j = 0; j < pi * 2; j++)
                    {
                        if(moneti[nomera[j]]!=2)
                        moneti[nomera[j]] = 1; // 1 - статус возможно фальшивой монеты
                     }
                }
            }
            int nsusp=-111111;
            int nuncl = -111111;
            //for (int i = 1; i < n + 1; i++)
            //{
            //    Console.Write(moneti[i] + "  ");
            //}
            for (int i = 1; i < n+1; i++)
            {
                if (moneti[i] == 1)
                {
                    suspect++;
                    nsusp = i;
                }
                else if (moneti[i] == 0)
                {
                    unclear++;
                    nuncl = i;
                }
               

            }
            //Console.WriteLine();
            //Console.WriteLine();
            //Console.WriteLine(suspect);
            //Console.WriteLine(unclear);
            //Console.WriteLine(nsusp);
            //Console.WriteLine(nuncl);
            //Console.WriteLine();
            if (suspect == 1)
                Console.WriteLine(nsusp);
            else if ((suspect == 0) && (unclear == 1))
                Console.WriteLine(nuncl);
            else
                Console.WriteLine(0);


        }
    }
}

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