static void Main(string[] args)
{
string[] input = new string[3];
for (int i = 0; i < 3; i++)
input[i] = Console.ReadLine();
bool finish = false;
if (input[0][0] != input[2][2])
{
Console.WriteLine("NO");
finish = true;
}
if (finish == false)
{
if (input[1][0] != input[1][2])
{
Console.WriteLine("NO");
finish = true;
}
}
if (finish == false)
{
if (input[2][0] != input[0][2])
{
Console.WriteLine("NO");
finish = true;
}
}
if (finish == false)
{
if (input[0][1] != input[2][1])
{
Console.WriteLine("NO");
finish = true;
}
}
if(!finish)
Console.WriteLine("YES");
Console.ReadLine();
}