using System.Numerics;

public class Program
{
    public static void Main()
    {

        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        List<char> chars = [];

        for (int i = 0; i < 3; i++)
        {
            string str = Console.ReadLine() ?? string.Empty;

            chars.Add(str[0]);
            chars.Add(str[1]);
            chars.Add(str[2]);
        }

        for (int i = 0; i < chars.Count - 1; i++)
        {
            if (chars[i] == chars[i + 1])
            {
                Console.WriteLine("No");
                return;
            }
        }
        for (int i = 0; i < 3; i++)
        {
            if (chars[i] == chars[i + 3] )//|| chars[i] == chars[i + 6])
            {
                Console.WriteLine("No");
                return;
            }
        }
        Console.WriteLine("Yes");
    }
}