using System;

public class Program

{

    public static void Main()

    {

        string knightMove = Console.ReadLine();

        string letters = "ABCDEFGH";

        string numerals = "12345678";

        int firstLetter = 0;

        int secondLetter = 0;

        int firstNumeral = Convert.ToInt32(char.GetNumericValue(knightMove[1]));

        int secondNumeral =Convert.ToInt32(char.GetNumericValue(knightMove[4]));

        for(int cellLetter = 0; cellLetter < letters.Length; cellLetter++)

        {

            if(knightMove[0] == letters[cellLetter])

            {

            firstLetter = Convert.ToInt32(char.GetNumericValue(numerals[cellLetter]));

            }

        }

        for(int cellLetter = 0; cellLetter < letters.Length; cellLetter++)

        {

            if(knightMove[3] == letters[cellLetter])

            {

                secondLetter = Convert.ToInt32(char.GetNumericValue(numerals[cellLetter]));

            }

        }

        if((Math.Abs(firstLetter - secondLetter) == 2 && Math.Abs(firstNumeral - secondNumeral) == 1) || (Math.Abs(firstLetter - secondLetter) == 1 && Math.Abs(firstNumeral - secondNumeral) == 2))                                     

        {

            Console.WriteLine("Да");

        }

        else

        {

            Console.WriteLine("Нет");

        }

    }

}