class Program
{
    static void Main(string[] args)
    {
        string oldVersion = Console.ReadLine()!;
        string version = Console.ReadLine()!;

        oldVersion = oldVersion.Remove(1, 1);
        oldVersion = oldVersion.Remove(2, 1);

        version = version.Remove(1, 1);
        version = version.Remove(2, 1);

        int topNum = int.Parse(oldVersion);
        int bottomNum = int.Parse(version);

        if (topNum > bottomNum)
        {
            Console.WriteLine("YES");
        }
        else
        {
            Console.WriteLine("NO");
        }
    }
}