using System;

public class Program

{

    public static void Main()

    {

        char[,] matrix = new char[3, 3];

        for(int i = 0; i < 3; i++)

        {

            string line = Console.ReadLine();

            for(int j = 0; j < 3; j++)

            {

                matrix[i, j] = line[j];

            }

        }

        if(matrix[0, 0] == matrix[2, 2]

           && matrix[0, 1] == matrix[2, 1]

           && matrix[0, 2] == matrix[2, 0]

           && matrix[1, 0] == matrix[1, 2])

        {

            Console.WriteLine("YES");

        }

        else

        {

            Console.WriteLine("NO");

        }

    }

}