using System;

public class Program

{

    public static void Main()

    {

        int x1=Convert.ToInt32(Console.ReadLine());

        int y1=Convert.ToInt32(Console.ReadLine());

        int x2=Convert.ToInt32(Console.ReadLine());

        int y2=Convert.ToInt32(Console.ReadLine());

        if (x1==x2 || y1==y2)Console.WriteLine("yes");

        else Console.WriteLine("no");

        //  &&-и  ||- или       

                             }

}