using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Numerics;
using System.Text.RegularExpressions;

namespace DebbugingSpace
{
    class Program
    {
        static void Main(string[] args)
        {

            BigInteger count = BigInteger.Parse(Console.ReadLine());

            Dictionary<string, Dictionary<string, string>> files =
                new Dictionary<string, Dictionary<string, string>>();

            string fileName = "";

            for (int i = 0; i < count; i++)
            {

                var input = Console.ReadLine();
                var inputActual = input.Split(new char[] {'\\', ';', ' '}, StringSplitOptions.RemoveEmptyEntries)
                    .ToArray();

                string homeDirectory = inputActual[0];

                string size = inputActual.Last();

                string pattern = @"\b\w+.\w+\b";

                foreach (Match m in Regex.Matches(input, pattern))
                {

                    fileName = m.Value;

                }

                if (!files.ContainsKey(homeDirectory))
                {

                    files.Add(homeDirectory,new Dictionary<string, string>());

                }

                else
                {
                    if (!files[homeDirectory].ContainsKey(fileName))
                    {

                        files[homeDirectory].Add(fileName, size);
                    }

                    else
                    {
                        files[homeDirectory][fileName] = size;
                    }
                }

            }

            var lastInput = Console.ReadLine().Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries)
                .ToArray();

                string fileExtension = lastInput.First();
                string rootResult = lastInput.Last();

                foreach (var item in files)
                {

                    if (item.Equals(rootResult) && item.Value.ContainsKey(fileExtension))
                    {

                        Console.WriteLine("Yes");

                    }

                    else
                    {
                        Console.WriteLine("No");
                        break;
                    }

                }

        }
    }
}