using System;

public class Program

{

    public static void Main()

    {

        string knightMove = Console.ReadLine();

        string letters = "ABCDEFGH";

        string numerals = "12345678";

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

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

        int firstLetterNumericValue = 0;

        int secondLetterNumericValue = 0;

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

        {

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

            {

                firstLetterNumericValue = Convert.ToInt32(char.GetNumericValue(numerals[letterIndex]));

            }

        }

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

        {

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

            {

                secondLetterNumericValue = Convert.ToInt32(char.GetNumericValue(numerals[letterIndex]));

            }

        }

        int letterDiff = Math.Abs(firstLetterNumericValue - secondLetterNumericValue );

        int numeralDiff = Math.Abs(firstNumeral - secondNumeral);

        if(letterDiff == 2 && numeralDiff == 1

        ||letterDiff == 1 && numeralDiff == 2)

        {

            Console.WriteLine("Да");

        }

        else

        {

            Console.WriteLine("Нет");

        }

    }   

}